From: finjulhich@gmail.com   
      
   Hello,   
      
   Considering all the containers in the std library: array, forward_list,   
   list, dequeue, vector, set, multiset, map, multimap, unordered_set,   
   unordered_multiset, unordered_map and unordered_multimap, queue,   
   priority_queue and stack, and their iterator types,   
      
   What is the behaviour required from decrementing an iterator that =   
   begin(), and incrementing a iterator = end() ?   
      
   rds,   
   MM   
      
      
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