C12313211232233312111111312111133133313331323133323232322122212311   >>    C1231321123223331211111131211113313331333132313332323232212221231   <<    C12313211232233312111111312111133133313331323133323232322122212313   >>      C12313211232233312111111312111133133313331323133323232322122212312   >>