C21221212121211331313233313131133132333132313223313233313223221   >>    C2122121212121133131323331313113313233313231322331323331322322   <<    C21221212121211331313233313131133132333132313223313233313223223   >>      C21221212121211331313233313131133132333132313223313233313223222   >>