How does EE Cummings use alliteration since feeling is first?

E. E. Cummings repeats alliteration, or the same beginning sound of Words, several times in "since feeling is first". The first stanza has "will", "wholey", and "while" which all use the "W" sound as a form of alliteration. Towards the end of the poem, "laugh", "leaning", and "life" all use the "L" sound.