C11111211113313112113313331333133313331333132313231333133313331323231211   >>    C1111121111331311211331333133313331333133313231323133313331333132323121   <<    C11111211113313112113313331333133313331333132313231333133313331323231213   >>      C11111211113313112113313331333133313331333132313231333133313331323231212   >>