C11111211113313112113313331333133313331333132212111133131231221   >>    C1111121111331311211331333133313331333133313221211113313123122   <<    C11111211113313112113313331333133313331333132212111133131231223   >>      C11111211113313112113313331333133313331333132212111133131231222   >>