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   accordingly.
   
   '_' acts like '<' if it is true, and '>' if it is false.
   '|' acts like '^' if it is true, and 'v' if it is false.
   
   'While' loops can be made by sticking an 'if' in an infinite loop. For
   example,
   
   >_@
       
   (This program fragment pops all of the non-zero values off the stack,
   and the first zero value, then exits ['@' is the exit command.])
   
  Input
  
   The '&' command will get a numeric value from the standard input and
   push it on the stack. '~' will get the next ASCII character from
   standard input and push it on the stack.
   
   eg.