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   Symbol Table Organization 
A  symbol table is a set of data structures and associated procedures
that allow ``symbols'' (perhaps defined rather broadly) and associated
information to be stored and looked up.
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Symbol ``key'' Value | 
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Information about  | 
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 the Symbol  | 
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 Operations:
-   Insert: Insert a new symbol into the table.
 -   Search: Search for a symbol in the table.
 -   Search/Insert: Search for a symbol, Insert if not found.
 
We are often interested in the performance (expected time) of these operations.
There are more searches than insertions.