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  1. !! +var+ +exec+ +string+
  2. tit:sum
  3. type:$type_both
  4. alias:add
  5. syntax:!sum ``fn'' for ``v''=``v1'' to ``v2'' [step ``st'']\
  6. $ !sum ``fn'' for ``v'' in ``v1,v2,v3,...''
  7. mean:Computes the sum of a function ``fn(v)'' with variable ``v'' replaced successively\
  8.   by values ``v1'', ..., ``v2''. <p>\
  9.   In the second syntax, the values are given with respect to each item in the list ``v1,v2,...''.\
  10.   </p>
  11.