C11111211113313112113313331333133313133313232233133313232212131311   >>    C1111121111331311211331333133313331313331323223313331323221213131   <<    C11111211113313112113313331333133313133313232233133313232212131313   >>      C11111211113313112113313331333133313133313232233133313232212131312   >>