C11111211113313112113313331333133313331312111112133313223332211   >>    C1111121111331311211331333133313331333131211111213331322333221   <<    C11111211113313112113313331333133313331312111112133313223332213   >>      C11111211113313112113313331333133313331312111112133313223332212   >>