C21221212121211331313233313131133132333132313223313231333132211212121   >>    C2122121212121133131323331313113313233313231322331323133313221121212   <<    C21221212121211331313233313131133132333132313223313231333132211212123   >>      C21221212121211331313233313131133132333132313223313231333132211212122   >>