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tit:product
type:$type_both
alias:!prod, !multiply
syntax:!product `fn' for `v'=`v1' to `v2' [step `st']\
$ !product `fn' for `v' in `v1,v2,v3,...'
mean:¼ÆËã±äÁ¿ `v' Öð¸ö±» `v1' µ½ `v2' µÄÖµÌæ»»ºóº¯Êý `fn(v)' µÄ³Ë»ý. <p>\
ÔÚµÚ¶þ¾äÀï, Ìæ»»µÄÖµÊDZí `v1,v2,...' ÀïµÄ¸÷Ïî.