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Expressions
===========

   Many useful commands involve arithmetic expressions.  The syntax for
expressions in the command language is identical to that of C
expressions, with the following features:
   * All expressions evaluated as integers and are of "long" or
     "unsigned long" type.

   * All constants are integers.

   * All of the C arithmetic operators are provided.

   * You may reference, define, and create global variables.

   * You may call special purpose built-in functions.