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The following code implements an algorithm for finding cycles in a dependency graph. https://github.com/coler706/CoNLL-U_cycles Convert the code to javascript so that it is suitable for use in UD annotatrix. https://github.com/jonorthwash/ud-annotatrix The code can be included in: https://github.com/jonorthwash/ud-annotatrix/blob/master/standalone/lib/validation.js