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    Plan détaillé Texte intégral 1. Motivation and Background 2. Italian diachronic corpora 3. Corpus Creation 4. Corpus Statistics 5. Conclusions Bibliographie Notes de bas de page Auteurs

    Proceedings of the Seventh Italian Conference on Computational Linguistics CLiC-it 2020

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    A Diachronic Italian Corpus based on “L’Unità”

    Pierpaolo Basile, Annalina Caputo, Tommaso Caselli, Pierluigi Cassotti et Rossella Varvara

    p. 31-36

    Résumé

    In this paper, we describe the creation of a diachronic corpus for Italian by exploiting the digital archive of the newspaper “L’Unità”. We automatically clean and annotate the corpus with PoS tags, lemmas, named entities and syntactic dependencies. Moreover, we compute frequency-based time series for tokens, lemmas and entities. We show some interesting corpus statistics taking into account the temporal dimension and describe some examples of usage of time series.

    Texte intégral Bibliographie Notes de bas de page Auteurs

    Texte intégral

    1. Motivation and Background

    1Diachronic linguistics is one of the two major temporal dimensions of language study proposed by de Saussure in his Cours de languistique générale and has a long tradition in Linguistics. Recently, the increasing availability of diachronic corpora as well as the development of new NLP techniques for representing word meanings has boosted the application of computational models to investigate historical language data (Hamilton, Leskovec, and Jurafsky 2016; Tahmasebi, Borin, and Jatowt 2018; Tang 2018). This culminated in SemEval-2020 Unsupervised Lexical Semantic Change Detection (Schlechtweg et al. 2020), the first attempt to systematically evaluate automatic methods for language change detection.

    2Italian is a Romance language which has undergone lots of changes in its history. Its official adoption as a national language occurred only after the Unification of Italy (1861), having previously been a literary language. Diachronic corpora of Italian are currently available and accessible to the public (e.g., DiaCORIS and MIDIA ). Unfortunately, restricted access/distribution of these resources limits their utilisation. This actually prevents the investigation of more recent NLP methods to the diachronic dimensions.

    3To obviate this limit, we collect and make freely available1 a new corpus based on the newspaper “L’Unità”. Founded by Antonio Gramsci on February, 12th 1924, “L’Unità” was the official newspaper of the Italian Communist Party (PCI 2, henceforth). The newspaper had a troubled history: with the dissolution of PCI in 1991, the newspaper continued to live as the official newspaper of the new Democratic Party of the Left (PDS/DS) until July, 31th 2014. After that date, it ceased its publication until June, 30th 2015, and it was definitely closed on June, 3rd 2017.

    4Since 2017, the historical archive of “L’Unità” has been made again visible and available on the Web.3 One of the main issues of this resource is the lack of information about who owns the rights of the original archive. To our knowledge, the online version of the archive was legally obtained by downloading the original archive before the closure of the newspaper. The current archive, available online, does not contain the local editions of the newspaper and the photographic archive.

    5The main contribution of this work lies in the resource itself and its accessibility to the research community at large. The corpus is distributed in two formats: raw text and pre-processed. The validity of the corpus for the automatic study of language change is currently tested as part of the DIACR-Ita task 4 at EVALITA 2020. However, we illustrate some further potential applications of the use of the corpus.

    2. Italian diachronic corpora

    6Various Italian diachronic corpora are currently available and accessible to the public. DiaCORIS 5 (Onelli et al. 2006) comprises written Italian texts produced between 1861 and 1945, for a total of 100 million words, while MIDIA 6 (Gaeta et al. 2013) covers written documents in Italian between the beginning of the XIII century and the first half of the XX century, for a total of 7,5 million words over 800 texts belonging to different genres. The Corpus OVI dell’Italiano antico7 consists of 1948 texts from the XII to the XIV centuries, for a total of 536.000 words. The LIZ8 database comprehends 1,000 literary texts from the XIII to the XX century. Lastly, the Corpus of Alcide de Gasperi’s public documents (Tonelli et al. 2019) includes 1,762 documents (newspaper articles, propaganda documents, official letters, parliamentary speeches, for a total of 3.000.000 tokens) written from the Italian politician Alcide De Gasperi and published between 1901 and 1954.

    7These existing resources differ from each other and from the present corpus in different ways. First, the span of time the texts come from. The OVI Corpus considers texts from the early stages of the Italian language, with a time span of three centuries. The MIDIA corpus and the LIZ database cover 7 centuries, from the XIII to the first half of the XX century. DiaCORIS, the De Gasperi’s corpus and L’Unità corpus contain texts from a shorter and more recent period of time. However, the time span considered in L’Unità corpus is interesting for the study of the Italian language because of the deep changes that occurred in that period. Indeed, the second half of the XX century has seen a wider spread and use of Italian among all the social classes.

    8Second, these corpora differ for the genres represented. The DiaCORIS and MIDIA corpora have been designed as representative and balanced samples of written Italian (considering, among other genres, academic prose, fiction, press, legal texts, etc). The OVI corpus and the LIZ database comprehend only literary texts. The De Gasperi’s corpus is representative of political text from a single author. L’Unità corpus is representative only of press language, but this restriction may be an advantage in the study of diachronic lexical change. Indeed, observed semantic changes cannot be attributed to attestation from different genres in different periods, but can be interpreted as true semantic shifts.

    9Lastly, even if most of the corpora can be queried online (with the exception of the LIZ database), only the De Gasperi’s corpus can be freely downloaded. This restriction affects the usability of these resources for the NLP community. With L’Unità corpus we aim at releasing a new diachronic resource that is freely available and that can be used in the theoretical and computational study of language change.

    Table 1: An example of generated token features for the sentence: “Ehud Barak scende direttamente in campo per ufficializzare la candidatura dell’ex premier laburista.” [Ehud Barak takes the field to announce the candidacy of the former labour leader.]

    1

    Ehud

    Ehud

    PROPN

    SP

    nsubj

    3

    B-PER

    False

    False

    False

    Xxxx

    2

    Barak

    Barak

    PROPN

    SP

    flat:name

    1

    I-PER

    False

    False

    False

    Xxxxx

    3

    scende

    scendere

    VERB

    V

    ROOT

    0

    O

    False

    False

    False

    xxxx

    4

    direttamente

    direttamente

    ADV

    B

    advmod

    3

    O

    False

    False

    False

    xxxx

    5

    in

    in

    ADP

    E

    case

    6

    O

    False

    False

    True

    xx

    6

    campo

    campire

    NOUN

    S

    obl

    3

    O

    False

    False

    False

    xxxx

    7

    per

    per

    ADP

    E

    mark

    8

    O

    False

    False

    True

    xxx

    8

    ufficializzare

    ufficializzare

    VERB

    V

    advcl

    3

    O

    False

    False

    False

    xxxx

    9

    la

    la

    DET

    RD

    det

    10

    O

    False

    False

    True

    xx

    10

    candidatura

    candidatura

    NOUN

    S

    obj

    8

    O

    False

    False

    False

    xxxx

    11

    dell’

    dell’

    DET

    DD

    det

    13

    O

    False

    False

    False

    xxxx’

    12

    ex

    ex

    ADJ

    A

    amod

    13

    O

    False

    False

    True

    xx

    13

    premier

    premier

    NOUN

    S

    obj

    8

    O

    False

    False

    False

    xxxx

    14

    laburista

    laburista

    PROPN

    SP

    amod

    13

    O

    False

    False

    False

    xxxx

    3. Corpus Creation

    10The corpus creation consists of several steps:

    Downloading

    11All PDF files are downloaded from the source site and stored into a folder structure that mimics the publication year of each article.

    Text extraction

    12The text is extracted from the PDF files by using the Apache Tika library.9 First, the library tries to extract the embedded text if present in the PDF; otherwise the internal OCR is exploited. It is important to notice that during this step several OCR errors occur. In particular, during the processing of the early years, the newspaper has an unconventional format where a few large pages contain many articles split into several columns. Due to this format, the OCR is not able to correctly identify the column boundaries.

    Cleaning

    13In this step, we try to fix some text extraction issues. The previous step leaves an empty line when the end of a paragraph is reached. However, a paragraph can be composed of multiple lines which sometimes contain a word break at the end of the line. We manage word breaks in order to obtain a paragraph on a single text line; we still retain the empty line for delimiting paragraphs. Moreover, we remove noisy text by adopting two heuristics: (1) paragraphs must contain at least five tokens composed by only letter characters; (2) 60% of the paragraph must contain words that belong to a dictionary. The dictionary is built by extracting words that occur into the Paisà corpus (Lyding et al. 2014) taking into account only words composed by letters. The output of this process is a plain text file for each year where each paragraph is separated by an empty line.

    Processing

    14All plain text files produced by the cleaning step are processed by a Python script that splits each paragraph into sentences and analyses each sentence by performing several natural language processing tasks. We rely on the spaCy10 Python library for performing: tokenization, PoS-tagging, lemmatization, named entity recognition and dependency parsing. The spaCy library provides performance comparable to the state-of-the-art approaches with a good processing speed when compared to other NLP tools.11 We also provide the plain text in order to allow the processing with other tools. Each plain text file is analysed and transformed in vertical format adding two tags: <p>...</p> for the begin and the end of a paragraph, and <s>...</s> for delimiting sentences. The vertical format is compliant to the CONLL representation standard and the tag-set for the Italian12 is automatically mapped to the Universal Dependencies scheme13.

    Table 2: Description of token features

    Feature

    Description

    Position

    The token position in the sentence starting from 1

    Token

    The token

    Lemma

    The lemma

    PoS-tag

    The PoS tag

    Tag

    Additional tags, such as morphological tags

    Dependency

    Dependency type

    Head position

    Head position of the dependency

    IOB2 NE

    IOB2 tag of the named entity

    Punctuation

    Boolean indicating if punctuation

    Space

    Boolean indicating if space character

    Stop word

    Boolean indicating if stop word

    Shape

    The word shape – capitalisation,

    15The corpus spans 67 years from 1948 to 2014. For each year, we provide two files: (1) the plain text file containing the cleaned text extracted from PDF where each paragraph is delimited by an empty line; (2) a vertical file. In the vertical file format, exemplified in Table 1, each paragraph is split in sentences and tokens occurring in each sentence are annotated with 12 features, whose symbols and descriptions are reported in Table 1.

    4. Corpus Statistics

    16In this section, we report some corpus statistics. Table 2 illustrates the total number of occurrences and the dictionary size for each feature (token, lemma, and named entity, respectively).

    Table 3: Dictionary size and total number of occurrences.

    dict. size

    occurrences

    token

    4,177,128

    425,833,098

    lemma

    4,053,561

    425,833,098

    named entity

    5,429,470

    26,330,273

    17The corpus contains more than 400 million occurrences and more than 25 million named entities occurrences. The most frequent entities are Italia, Roma and PCI. This result is expected since “L’Unità” was the newspaper of the Italian Communist Party.

    18Figure 1 shows the PoS-tags14 frequency over time for open-class tags: NOUN, VERB, ADJective, ADVerb and PROPer Noun. The most frequent tag is NOUN followed by VERB, PROPN, ADJ and ADV. We observe that the frequency of PoS-tags is almost constant over time (excluding PROPN) underlying a stable language style that is typical for the news domain. We observe a variable usage of proper nouns, that may be related to the different types of events narrated over time that do not depend on a particular language style. Moreover, after the 1976, we observe a complementary trend between the adjectives and adverbs frequencies: the former slightly increase over time, while the latter decrease. This may denote a change in the language style that has varied to prefer the usage of adjectives over adverbs in more contemporary writing.

    Figure 1: PoS tags frequency over time for: NOUN, VERB, ADJective, ADVerb

    Image 10000000000003B0000001312E75D08468127BE7.jpg

    19An interesting analysis concerns the tokens occurrences per year, whose result is plotted in Figure 1. We observe a low number of occurrences in the period (1948-1970), probably due to two factors: (1) the first period contains many OCR errors and noise removed during the cleaning step; (2) the number of pages of the newspaper increases over time. The latter may also explain the lower number of tokens for some of the years, such as 1981, 1995, 2000, 2007-2008, 2014. In particular, the latest years are characterised by management issues (e.g. the newspaper liquidation in July 2000) that were reflected in the newspaper format.

    Figure 2: The plot of token occurrences per year

    Image 10000000000003B00000023953982B5E7510C091.jpg

    20We also compute the time series of normalised occurrences (frequency) for each token, lemma, and named entity. All the aforementioned statistics are distributed in separate files together with the corpus.

    21As an illustrative example of the potential use of the corpus, in Figure 2 we plot the time series for two keywords. The first, comunismo [comunism], is assumed to be pivotal to this corpus due to the specific role played by the newspaper in relation to the PCI. The second keyword, antipolitica [anti-politics], is particularly interesting as it is a term used to describe the current state of the political life in Italy, characterised by a high level of distrusts in parties and, more generally, in politics.

    Figure 3: Plot of the time series for the words comunismo [comunism] and antipolitica [anti-politics]

    Image 10000000000003B0000001A1F2B520390FF0A934.jpg

    22The lifespan of comunismo [comunism] appears to be extremely influenced and characterised by history. We observe two big spikes in the time series. The first is around 1962, one of the harshest year of the Cold War, witnessing the Cuban missile crisis. The second spike is between 1989 and 1991, corresponding to the beginning of the worldwide crisis of the communist movement and the dissolution of PCI. After 1991, the frequency of the term constantly decreases. Interestingly, the frequency for comunismo [comunism] is low between 1968 and 1988, a period of time that witnessed a cultural hegemony of leftist movements and strong criticism against the U.S.S.R. On the other hand, we observe that antipolitica [anti-politics] is a recent term whose first appearance dates back to 1977. The word frequency starts to increase slowly from 1999 and it reaches its peak in 2012 with the unexpected electoral success of the populist 5 Star Movement at the local elections in May.

    23Using the same approach, we plot the time series for two named entities: PCI and Berlusconi. We notice that the frequency of PCI start dropping in 1986, few years before its dissolution in 1991, while the name Berlusconi has a substantial increase in 1994 when he became the Italian Prime Minister.

    Figure 4: Plot of the time series for the entities PCI and Berlusconi

    24Finally, we investigate how the vocabulary changes between two periods: T1=[1948-1958] and T2=[2004-2014]. For each period we build the vocabulary Vi taking into account only words that occur at least 10 times. Then, we compute the differences between the two dictionaries, Image 100000000000003300000013722CE294B0D80B5C.jpgand Image 100000000000003300000013A75DF175E5408019.jpg, and sort the words in descending order by occurrences. We observe that the words agrari, imperialisti, mezzadri, monarchici15 appear frequently in T1 and never appear in T2, conversely the words euro, centrosinistra, centrodestra, immigrati16 appear only in T2. A similar analysis was executed on named entities17 and shows that Scelba, D.C., PSI, U.R.S.S. are specific to T1, while Berlusconi, PD, Bush, Obama to T2, revealing differences in topics and people covered by the newspaper.

    5. Conclusions

    25In this paper, we describe an Italian diachronic corpus based on the newspaper “L’Unità”. The corpus spans 67 years (1948-2014) and is provided both in plain text and in an annotated format that includes PoS-tags, lemmas, named entities, and syntactic dependencies. We compute some statistics and time series for each token, lemma and named entity. We think that the corpus and the pre-computed data are a valuable source of information both for linguists and researchers interested in diachronic analysis of the Italian language, and for historians, political scientists, and journalists as a digital resource enriched with automatic text analysis technologies.

    26However, the corpus has some issues that we plan to fix in the future, such as OCR errors and logical document structure recognition. We also plan to process the corpus by exploiting other Italian NLP pipelines in order to understand the differences between the output of different tools. Finally, we are working on generating and making available temporal word embeddings for each year.

    Bibliographie

    Des DOI sont automatiquement ajoutés aux références bibliographiques par Bilbo, l’outil d’annotation bibliographique d’OpenEdition. Ces références bibliographiques peuvent être téléchargées dans les formats APA, Chicago et MLA.

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    Hamilton, W. L., Leskovec, J., & Jurafsky, D. (2016). Diachronic Word Embeddings Reveal Statistical Laws of Semantic Change. Presented at the Proceedings of the 54th Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers). https://doi.org/10.18653/v1/p16-1141
    TANG, X. (2018). A state-of-the-art of semantic change computation. Cambridge University Press (CUP). https://doi.org/10.1017/s1351324918000220
    Hamilton, William L., Jure Leskovec, and Dan Jurafsky. “Diachronic Word Embeddings Reveal Statistical Laws of Semantic Change”. Proceedings of the 54th Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers). Association for Computational Linguistics, 2016. doi:10.18653/v1/p16-1141.
    TANG, XURI. “A State-of-the-Art of Semantic Change Computation”. Natural Language Engineering. Cambridge University Press (CUP), June 18, 2018. doi:10.1017/s1351324918000220.
    Hamilton, William L., et al. “Diachronic Word Embeddings Reveal Statistical Laws of Semantic Change”. Proceedings of the 54th Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers), Association for Computational Linguistics, 2016. Crossref, https://doi.org/10.18653/v1/p16-1141.
    TANG, XURI. “A State-of-the-Art of Semantic Change Computation”. Natural Language Engineering, vols. 24, nos. 5, Cambridge University Press (CUP), 18 June 2018, pp. 649-76. Crossref, https://doi.org/10.1017/s1351324918000220.

    Cette bibliographie a été enrichie de toutes les références bibliographiques automatiquement générées par Bilbo en utilisant Crossref.

    Livio Gaeta, Iacobini Claudio, Ricca Davide, Angster Marco, De Rosa Aurelio, and Schirato Giovanna. 2013. “MIDIA: A Balanced Diachronic Corpus of Italian.” In 21st International Conference on Historical Linguistics.

    William L. Hamilton, Jure Leskovec, and Dan Jurafsky. 2016. “Diachronic word embeddings reveal statistical laws of semantic change.” In 54th Annual Meeting of the Association for Computational Linguistics, Acl 2016 - Long Papers, 3:1489–1501. https://doi.org/10.18653/v1/p16-1141.

    10.18653/v1/p16-1141 :

    Verena Lyding, Egon Stemle, Claudia Borghetti, Marco Brunello, Sara Castagnoli, Felice Dell’Orletta, Henrik Dittmann, Alessandro Lenci, and Vito Pirrelli. 2014. “The Paisa’corpus of Italian Web Texts.” In 9th Web as Corpus Workshop (Wac-9)@ Eacl 2014, 36–43. EACL (European chapter of the Association for Computational Linguistics).

    Corinna Onelli, Domenico Proietti, Corrado Seidenari, and Fabio Tamburini. 2006. “The DiaCORIS Project: A Diachronic Corpus of Written Italian.” In Proceedings of the Fifth International Conference on Language Resources and Evaluation (LREC’06). Genoa, Italy: European Language Resources Association (ELRA). http://www.lrec-conf.org/proceedings/lrec2006/pdf/611_pdf.pdf.

    Dominik Schlechtweg, Barbara McGillivray, Simon Hengchen, Haim Dubossarsky, and Nina Tahmasebi. 2020. “SemEval-2020 Task 1: Unsupervised Lexical Semantic Change Detection.” arXiv Preprint arXiv:2007.11464.

    Nina Tahmasebi, Lars Borin, and Adam Jatowt. 2018. “Survey of Computational Approaches to Lexical Semantic Change.” 1st International Workshop on Computational Approaches to Historical Language Change 2019. http://arxiv.org/abs/1811.06278.

    Xuri Tang. 2018. “A state-of-the-art of semantic change computation.” Natural Language Engineering 24 (5): 649–76. https://doi.org/10.1017/S1351324918000220.

    10.1017/S1351324918000220 :

    Sara Tonelli, Rachele Sprugnoli, Giovanni Moretti, and Fondazione Bruno Kessler. 2019. “Prendo La Parola in Questo Consesso Mondiale: A Multi-Genre 20th Century Corpus in the Political Domain.” In CLiC-It.

    Notes de bas de page

    1 https://github.com/swapUniba/unita/

    2 It is the acronym of Partito Comunista Italiano.

    3 https://archivio.unita.news/

    4 https://diacr-ita.github.io/DIACR-Ita/

    5 http://corpora.dslo.unibo.it/DiaCORIS/

    6 www.corpusmidia.unito.it

    7 http://gattoweb.ovi.cnr.it

    8 https://www.zanichelli.it/ricerca/prodotti/liz-4-0-letteratura-italiana-zanichelli

    9 https://tika.apache.org/

    10 https://spacy.io/

    11 https://spacy.io/usage/facts-figures

    12 https://spacy.io/api/annotation

    13 http://universaldependencies.org/u/pos/

    14 The used tag-set is described here https://universaldependencies.org/u/pos/

    15 In English: agrarians, imperialists, sharecroppers, monarchists.

    16 In English: euro, centre-left politics, centre-right politics, immigrants.

    17 In this case we consider only entities that appear at least 5 times.

    Auteurs

    • Pierpaolo Basile

      Dept. of Computer Science, University of Bari, Italy – pierpaolo.basile@uniba.it

    • Annalina Caputo

      ADAPT Centre, School of Computing, Dublin City University – annalina.caputo@dcu.ie

    • Tommaso Caselli

      CLCG, University of Groningen, Netherlands – t.caselli@rug.nl

    • Pierluigi Cassotti

      Dept. of Computer Science, University of Bari, Italy – pierluigi.cassotti@uniba.it

    • Rossella Varvara

      DILEF, University of Florence, Italy – rossella.varvara@unifi.it

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    1 https://github.com/swapUniba/unita/

    2 It is the acronym of Partito Comunista Italiano.

    3 https://archivio.unita.news/

    4 https://diacr-ita.github.io/DIACR-Ita/

    5 http://corpora.dslo.unibo.it/DiaCORIS/

    6 www.corpusmidia.unito.it

    7 http://gattoweb.ovi.cnr.it

    8 https://www.zanichelli.it/ricerca/prodotti/liz-4-0-letteratura-italiana-zanichelli

    9 https://tika.apache.org/

    10 https://spacy.io/

    11 https://spacy.io/usage/facts-figures

    12 https://spacy.io/api/annotation

    13 http://universaldependencies.org/u/pos/

    14 The used tag-set is described here https://universaldependencies.org/u/pos/

    15 In English: agrarians, imperialists, sharecroppers, monarchists.

    16 In English: euro, centre-left politics, centre-right politics, immigrants.

    17 In this case we consider only entities that appear at least 5 times.

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    Basile, P., Caputo, A., Caselli, T., Cassotti, P., & Varvara, R. (2020). A Diachronic Italian Corpus based on “L’Unità”. In F. Dell’Orletta, J. Monti, & F. Tamburini (éds.), Proceedings of the Seventh Italian Conference on Computational Linguistics CLiC-it 2020. Torino: Accademia University Press. https://doi.org/10.4000/books.aaccademia.8245
    Basile, Pierpaolo, Annalina Caputo, Tommaso Caselli, Pierluigi Cassotti, et Rossella Varvara. « A Diachronic Italian Corpus Based on “L’Unità” ». In Proceedings of the Seventh Italian Conference on Computational Linguistics CLiC-It 2020, édité par Felice Dell’Orletta, Johanna Monti, et Fabio Tamburini. Torino: Accademia University Press, 2020. doi:10.4000/books.aaccademia.8245.
    Basile, Pierpaolo, et al. « A Diachronic Italian Corpus Based on “L’Unità” ». Proceedings of the Seventh Italian Conference on Computational Linguistics CLiC-It 2020, édité par Felice Dell’Orletta et al., Accademia University Press, 2020, https://doi.org/10.4000/books.aaccademia.8245.

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    Dell’Orletta, F., Monti, J., & Tamburini, F. (éds.). (2020). Proceedings of the Seventh Italian Conference on Computational Linguistics CLiC-it 2020. Torino: Accademia University Press. https://doi.org/10.4000/books.aaccademia.8203
    Dell’Orletta, Felice, Johanna Monti, et Fabio Tamburini, éd. Proceedings of the Seventh Italian Conference on Computational Linguistics CLiC-It 2020. Torino: Accademia University Press, 2020. doi:10.4000/books.aaccademia.8203.
    Dell’Orletta, Felice, et al., éditeurs. Proceedings of the Seventh Italian Conference on Computational Linguistics CLiC-It 2020. Accademia University Press, 2020, https://doi.org/10.4000/books.aaccademia.8203.
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