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BSD 4.3

procedure fix(exp)
   while exp ?:= 2(="(",tab(bal(')')),pos(-1))
   return lassoc(exp,'+-' | '*/') | rassoc(exp,'^') |
      func(exp) | exp
end

procedure func(exp)
   return exp ? tab(upto('(') + 1) || fix(tab(-1)) || tab(0)
end

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