Assertion: limerick's line | /r/CapableOf | introduce the protagonist
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Source sentences:
text: Connected with this formal patterning is the fact that each line has a fixed narrative function: the first line introduces the protagonist describing him in relation to a geographic location or, sometimes, a physical feature; the second qualifies him/her, usually introducing some peculiar habit; the third line is generally strictly narrative, often in dialogic form, and the final line either closes the story (4.2.) or further qualifies the character according to what has been told (4.1.).