C11112331312111112111133133313331333132313233313231323223313221221   >>    C1111233131211111211113313331333133313231323331323132322331322122   <<    C11112331312111112111133133313331333132313233313231323223313221223   >>      C11112331312111112111133133313331333132313233313231323223313221222   >>