C1111233131211111211113313331333133313232321333131333131133112113312121   >>    C111123313121111121111331333133313331323232133313133313113311211331212   <<    C1111233131211111211113313331333133313232321333131333131133112113312123   >>      C1111233131211111211113313331333133313232321333131333131133112113312122   >>