C11112331312111112111133133313231333132313232233133313233323221   >>    C1111233131211111211113313331323133313231323223313331323332322   <<    C11112331312111112111133133313231333132313232233133313233323223   >>      C11112331312111112111133133313231333132313232233133313233323222   >>