Read the following lines from "ten songs" Walked through a wood, saw the birds in the trees; They had no plitcians and sang at their ease: They weren't human race, my dear, they weren't the human race Dreamed I saw a building with a thousand floors, A thousand windows and a thousand doors, Not one of them was ours,my dear not one of them was ours Stood on a great plain the falling snow; Ten thousand soldiers marched to and fro Looking for you and me, my dear looking for you and me What structure was this in? aab bbc ccd aab bbd eef aba bcb cdc aba bcb cdc