C11112331312111112111133132313331333133313232212111133312112121   >>    C1111233131211111211113313231333133313331323221211113331211212   <<    C11112331312111112111133132313331333133313232212111133312112123   >>      C11112331312111112111133132313331333133313232212111133312112122   >>