How do the lines in "the black snake" contribute to the structure of the poem? ?

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Even though there are no clear stanzas, the poem forms patterns with its lines. There are four sets of four lines each. Each set begins with "Black snake!" In each set of lines, the second line always ends in a comma. The repetition of these small details creates patterns and helps establish rhythm. Also, in each set of lines, the fourth line ends with a period. This tells the reader that this thought is over and that a new idea is beginning. In each set of four lines, the second and fourth line always rhymes.