Could you please explain to me step by step how to Prove Theorem 3.2.2 by paying attention to proof of Theorem 3.2.1. Theorem 3.2.2: Suppose a = a0 + a1i + a2j + a3k Hs and 2: Hs -> Hs, 2 (a) = 2 (a0 + a1i + a2j + a3k) = (a0 - a1i + a3j - a2k), then 2 is the arena endomorphism. Theorem 3.2.1: Suppose a = a0 + a1i + a2j + a3k Hs and 1: Hs -> Hs, 1 (a) = 1 (a0 + a1i + a2j + a3k) = a0 + a1i - a3j - a2k), then 1 is a rink endomorphism