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searchers.append(Searcher(2019, 2020, 'CEO[cois]+OR+CTO[cois]+OR+CSO[cois]', run=1, retmax=10000)) searchers.append(Searcher(2018, 2019, 'CEO[cois]+OR+CTO[cois]+OR+CSO[cois]', run=1, retmax=10000)) # Create a dictionary to store keywords for all articles from a particular year keywords_dict =