C11111211113313112113313331333133312111113331333133313332233132331123211111   >>    C1111121111331311211331333133313331211111333133313331333223313233112321111   <<    C11111211113313112113313331333133312111113331333133313332233132331123211113   >>      C11111211113313112113313331333133312111113331333133313332233132331123211112   >>