C2122121212121133131323331313113313233313231322331323132313221221   >>    C212212121212113313132333131311331323331323132233132313231322122   <<    C2122121212121133131323331313113313233313231322331323132313221223   >>      C2122121212121133131323331313113313233313231322331323132313221222   >>