length = 4 length = 4 length = 4 length = 4 length = 4 length = 4 length = 4 length = 4 length = 4 length = 4 length = 4 length = 4 length = 4 length = 4 length = 4 length = 4 length = 4 length = 4 length = 4 length = 4 length = 4 length = 4 length = 4 length = 4 length = 4 length = 4 length = 4 length = 4 length = 4 length = 4 length = 4 length = 4 length = 4 length = 4 length = 4 length = 4 length = 8 length = 8 length = 8 length = 8 length = 8 length = 8 length = 8 length = 8