C1111233131211111211113313331333133313232321333133313331333123233233321   >>    C111123313121111121111331333133313331323232133313331333133312323323332   <<    C1111233131211111211113313331333133313232321333133313331333123233233323   >>      C1111233131211111211113313331333133313232321333133313331333123233233322   >>