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Rev 5766 Rev 11219
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!! +var+ +exec+ +string+
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!! +var+ +exec+ +string+
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tit:product
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 $lst_tit product$lst_titend$type_both
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type:$type_both
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 $lst_alias prod, multiply
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alias:!prod, !multiply
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  $(lst_syntax)product $emph fn$emphend for $emph v$emphend=$emph v1$emphend
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syntax:!product `fn' for `v'=`v1' to `v2' [step `st']\
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  to $emph v2$emphend [step $emph st $emphend], »ò <br/>
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$ !product $emph fn$emphend for $emph v$emphend in
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$ !product `fn' for `v' in `v1,v2,v3,...'
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  $emph v1,v2,v3,...$emphend</tt>
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  $lst_mean ¼ÆËã±äÁ¿ $emph v $emphend Öð¸ö±» $emph v1$emphend µ½
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  $emph v2$emphend µÄÖµÌæ»»ºóº¯Êý $emph fn(v)$emphend µÄ³Ë»ý. <p>
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mean:¼ÆËã±äÁ¿ `v' Öð¸ö±» `v1' µ½ `v2' µÄÖµÌæ»»ºóº¯Êý `fn(v)' µÄ³Ë»ý. <p>\
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  ÔÚµÚ¶þ¾äÀï, Ìæ»»µÄÖµÊDZí $emph v1,v2,...$emphend ÀïµÄ¸÷Ïî.
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  ÔÚµÚ¶þ¾äÀï, Ìæ»»µÄÖµÊDZí `v1,v2,...' ÀïµÄ¸÷Ïî.
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