C11111211113313112113313331333133313231323223313331311331323223212312321   >>    C1111121111331311211331333133313331323132322331333131133132322321231232   <<    C11111211113313112113313331333133313231323223313331311331323223212312323   >>      C11111211113313112113313331333133313231323223313331311331323223212312322   >>