C11112331312111112111133133313331333132322121111331312113313331323133313231221   >>    C1111233131211111211113313331333133313232212111133131211331333132313331323122   <<    C11112331312111112111133133313331333132322121111331312113313331323133313231223   >>      C11112331312111112111133133313331333132322121111331312113313331323133313231222   >>