C111123313331323113313331333133313121111133112111133132233133313113313221321   >>    C11112331333132311331333133313331312111113311211113313223313331311331322132   <<    C111123313331323113313331333133313121111133112111133132233133313113313221323   >>      C111123313331323113313331333133313121111133112111133132233133313113313221322   >>