C11111211113313112113313331333133313133313232233131121133132212321   >>    C1111121111331311211331333133313331313331323223313112113313221232   <<    C11111211113313112113313331333133313133313232233131121133132212323   >>      C11111211113313112113313331333133313133313232233131121133132212322   >>