C11111211113313112113313331333133313331333132322121111123123121   >>    C1111121111331311211331333133313331333133313232212111112312312   <<    C11111211113313112113313331333133313331333132322121111123123123   >>      C11111211113313112113313331333133313331333132322121111123123122   >>