C21221212121211331313233313131133132333132313223313232313231313221   >>    C2122121212121133131323331313113313233313231322331323231323131322   <<    C21221212121211331313233313131133132333132313223313232313231313223   >>      C21221212121211331313233313131133132333132313223313232313231313222   >>