Read the poem and answer the question. The potter's wheel whirled, wet and white, The clay rose slowly, round and rare; The kiln was a cave of secret fire, And smoke wrote letters on the air. The bowls gleamed like monsoon pools, The handles curved in quiet pride; Cool corners kept the cups from harm, And dusk was a river, wide. "The potter's wheel whirled, wet and white" is alliteration because it repeats the: