C11111211113313112113313331333133313331333132313231333133313211   >>    C1111121111331311211331333133313331333133313231323133313331321   <<    C11111211113313112113313331333133313331333132313231333133313213   >>      C11111211113313112113313331333133313331333132313231333133313212   >>