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Many useful classes operate as containers of elements.
Techniques for accessing these elements from a container differ from class to class. The containers use these pointers to extract items. In general it is a very bad idea to perform traversals in the the midst of destructive modifications to containers. Set i to index the first element of a or 0 if a is empty. This is often a relatively slow operation, since the collection must usually traverse through elements to see if any correspond to the Pix.