A rhyme that builds tension, that increases the readers' comfort level and understanding of the poem, that lack of sing-song pattern increases readers' focus, and that may emphasize another rhyme schemes is a(n) rhyme scheme.

Half rhyme

Explanation:

A half rhyme also known as slant or imperfect rhyme is that in which the stressed syllables of ending consonants match, but vowel's sounds not, this makes that they do not follow a sing sing pattern.

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