C11111211113313112113313331333133313133313233112111133132313232212321321   >>    C1111121111331311211331333133313331313331323311211113313231323221232132   <<    C11111211113313112113313331333133313133313233112111133132313232212321323   >>      C11111211113313112113313331333133313133313233112111133132313232212321322   >>