C11111211113313112113313331333133313331323133313223232132313231   >>    C1111121111331311211331333133313331333132313331322323213231323   <<    C11111211113313112113313331333133313331323133313223232132313233   >>      C11111211113313112113313331333133313331323133313223232132313232   >>