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  1. !! +exec+ +var+ +string+
  2. tit:varlist
  3. type:$type_both
  4. alias:listvar
  5. syntax:!varlist [nofn] ``formula''
  6. mean:Manipulation of mathematical expressions: returns list of variable\
  7.   names (and function names) appearing in the ``formula''. <p>\
  8.   If the switch ``nofn'' is present, function names will not be listed.</p>
  9.