Read the excerpt from “I Hear American Singing.” Those of mechanics, each one singing his as it should be blithe and strong,

The carpenter singing his as he measures his plank or beam,

The mason singing his as he makes ready for work, or leaves off work,

The boatman singing what belongs to him in his boat, the deckhand singing on the steamboat deck,

Which is one way that Walt Whitman uses repetition in this excerpt?