The condition over d is important because the sentence aligner may fail to match some subsequences, creating false ATFs.
what is missed from one sentence will be missed also in the other sen-Train Test τ Ancillary Important Total Ancillary Important Total  1  971  687  1658  387  687  1074  2  426  364  790  166  151  317  3  166  169  335  62  79  141  4  59  73  132  21 36 57 .