C11111211113313112113313331333133313133313232233133313133132321   >>    C1111121111331311211331333133313331313331323223313331313313232   <<    C11111211113313112113313331333133313133313232233133313133132323   >>      C11111211113313112113313331333133313133313232233133313133132322   >>