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  1. Add some new functions from `math.h' to the initialization list.

  2. Add another array that contains constants and their values.  Then
     modify `init_table' to add these constants to the symbol table.
     It will be easiest to give the constants type `VAR'.

  3. Make the program report an error if the user refers to an
     uninitialized variable in any way except to store a value in it.

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