C21221212121211331313233313131133132333132313223313113313132211   >>    C2122121212121133131323331313113313233313231322331311331313221   <<    C21221212121211331313233313131133132333132313223313113313132213   >>      C21221212121211331313233313131133132333132313223313113313132212   >>