C3131313233313113313223313223313112113313233313133313233313232322121   >>    C313131323331311331322331322331311211331323331313331323331323232212   <<    C3131313233313113313223313223313112113313233313133313233313232322123   >>      C3131313233313113313223313223313112113313233313133313233313232322122   >>