C1111233131211111211113313331333133313221211113313331333133313231121121121   >>    C111123313121111121111331333133313331322121111331333133313331323112112112   <<    C1111233131211111211113313331333133313221211113313331333133313231121121123   >>      C1111233131211111211113313331333133313221211113313331333133313231121121122   >>