C11111211113313112113313331333133313231323223313113313221311211   >>    C1111121111331311211331333133313331323132322331311331322131121   <<    C11111211113313112113313331333133313231323223313113313221311213   >>      C11111211113313112113313331333133313231323223313113313221311212   >>