C111123313331323113313331333133313121111133112121111331311211331323221311321   >>    C11112331333132311331333133313331312111113311212111133131121133132322131132   <<    C111123313331323113313331333133313121111133112121111331311211331323221311323   >>      C111123313331323113313331333133313121111133112121111331311211331323221311322   >>