sentence2_structure: The human penis<>contains<>the urethra, as well as three cylinders of spongy erectile tissue
sentence1: The penis mostly consists of the urethra and three cylindrical bodies of erectile tissues.
sentence2: The human penis contains the urethra, as well as three cylinders of spongy erectile tissue.
question: The human penis contains the urethra, as well as how many cylinders of spongy erectile tissue?