C1111233131211111211113313331333133313232212111133132223112211231221   >>    C111123313121111121111331333133313331323221211113313222311221123122   <<    C1111233131211111211113313331333133313232212111133132223112211231223   >>      C1111233131211111211113313331333133313232212111133132223112211231222   >>