C212212121212113313221323131323133313132322331323323331323221221   >>    C21221212121211331322132313132313331313232233132332333132322122   <<    C212212121212113313221323131323133313132322331323323331323221223   >>      C212212121212113313221323131323133313132322331323323331323221222   >>