C1111233131211111211113313331333132313231323223313232233132213111   >>    C111123313121111121111331333133313231323132322331323223313221311   <<    C1111233131211111211113313331333132313231323223313232233132213113   >>      C1111233131211111211113313331333132313231323223313232233132213112   >>