Sentence:  As for the strict forms in which the original poems were written, it seemed an empty exercise to force English into those particular strictures, which in Bengali literary tradition are richly associative but which in English are not. The familiar fourteen-syllable "payār" couplet with its "aa bb cc" rhymes and the more intricate three-<WSD>footed</WSD> "tripadi" of variable length and rhyme were the first casualties of the process. 
Meaning of the word marked with <WSD> tags:  Consisting of, or having been put into, metrical feet (of a specified character or number).