C11112331312111112111133133313331333132313233313231323223313221211   >>    C1111233131211111211113313331333133313231323331323132322331322121   <<    C11112331312111112111133133313331333132313233313231323223313221213   >>      C11112331312111112111133133313331333132313233313231323223313221212   >>