C11112331312111112111133132313331333133313233313331333132322133313232212321   >>    C1111233131211111211113313231333133313331323331333133313232213331323221232   <<    C11112331312111112111133132313331333133313233313331333132322133313232212323   >>      C11112331312111112111133132313331333133313233313331333132322133313232212322   >>