C21221212121211331313233313131133132333132313223313113313231322321   >>    C2122121212121133131323331313113313233313231322331311331323132232   <<    C21221212121211331313233313131133132333132313223313113313231322323   >>      C21221212121211331313233313131133132333132313223313113313231322322   >>