In the experiments, we removed from the above data set the zero-pronouns to which the two annotators did not agree.
the data set contained 995 intra-sentential anaphoric zero-pronouns, 754 inter-sentential anaphoric zero-pronouns, and 603 non-anaphoric zeropronouns (2,352 zero-pronouns in total), with each anaphoric zero-pronoun annotated to be linked to its antecedent.