The wood-cutter's song - the ploughboy's, on his way in the morning, or at the noon intermission, or at sundown; The delicious singing of the mother - or of the young wife at work - or of the girl sewing or washing - Each singing what belongs to her, and to none else;

The day what belongs to the day - At night, the party of young fellows, robust, friendly,

Singing, with open mouths, their strong melodious songs.

—“I Hear America Singing,”
Walt Whitman

Which two elements of structure does this portion of the poem contain?

repeated words
rhyming words at the end of each line
starting most lines with the same word
rhyming words within each line
starting all lines with the same word