C11112331312111112111133133313331333133311222121123313232212321   >>    C1111233131211111211113313331333133313331122212112331323221232   <<    C11112331312111112111133133313331333133311222121123313232212323   >>      C11112331312111112111133133313331333133311222121123313232212322   >>