C1111233131211111211113313331333133313113313231333133312111133132322123221   >>    C111123313121111121111331333133313331311331323133313331211113313232212322   <<    C1111233131211111211113313331333133313113313231333133312111133132322123223   >>      C1111233131211111211113313331333133313113313231333133312111133132322123222   >>