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tit:recursion
type:$type_both
syntax:!recursion `fn' for `v'=`v1' to `v2' [step `st']\
$ !recursion `fn' for `v' in `v1,v2,v3,...'
mean:ÈñäÁ¿ `v' Öð´ÎÈ¡´Ó `v1' µ½\
`v2' µÄÖµ, µÝ¹éµØ¼ÆË㺯Êý `fn' µÄÖµ. <p>\
Èç¹ûÊǵڶþ¾äµÄÐÎʽ, ±äÁ¿ÒÀ´ÎÈ¡±í `v1,v2,...' ÀïµÄÖµ. <p>\
º¯Êý `fn' ÄÚӦʹÓñäÁ¿ `last'\
±íʾÉÏÒ»´Î¼ÆËãµÃµ½µÄÖµ. ³õʼֵ¿ÉÒÔ·ÅÔÚWIMS±äÁ¿ <tt>$$recursion_start</tt> ÄÚ.