Once the verse text has been parsed and its syllables assigned " W " and " S " labels and hierarchical relationships, it can be compared with the metrical structure of the line ( also labeled " W " and " S " and with its own less complex bracketed relationships as above ) . " Labeling mismatches " may render the line more complex or unmetrical : different rules reflect different poets'practice . "'Bracketing'mismatches occur when the two patterns of W and S agree but the brackets to each pattern are out of sync as with trochaic words in an iambic line . " ( These only render the line more complex . ) The most essential test of metricality is " that the more closely an S-syllable in W-position is bound ( in the Liberman-Prince tree-notation ) to the syllable that precedes it, the more metrically disruptive it is ."
