C3121113331313231323132333131313231323131323223313233313233313232233132322221   >>    C312111333131323132313233313131323132313132322331323331323331323223313232222   <<    C3121113331313231323132333131313231323131323223313233313233313232233132322223   >>      C3121113331313231323132333131313231323131323223313233313233313232233132322222   >>