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Insertion
•The Insert operation attempts to insert a key (and element) into the map. If the key is already in the map, then Insert raises C_E; otherwise, it inserts the new key/element pair in the map.
•Include (a variation of Insert) attempts to insert the key, but if the key is already in the map, it replaces the existing key/element pair with the new key/element pair, instead of raising C_E.