C111123313331323113313331333133313331122112312111133133313121321   >>    C11112331333132311331333133313331333112211231211113313331312132   <<    C111123313331323113313331333133313331122112312111133133313121323   >>      C111123313331323113313331333133313331122112312111133133313121322   >>