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!! +var+ +exec+ +string+
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$lst_tit recursion$lst_titend$type_both
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  $(lst_syntax)recursion $emph fn$emphend for $emph v$emphend=$emph v1$emphend
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  to $emph v2$emphend [step $emph st $emphend], or <br/>
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$ !recursion $emph fn$emphend for $emph v$emphend in
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  $emph v1,v2,v3,...$emphend</tt>
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  $lst_mean Computes the outcome of a recursion using the function
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  $emph fn$emphend in which the
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  variable $emph v $emphend is replaced successively by values $emph v1$emphend,
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  ..., $emph v2$emphend. <p>
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  In the second syntax, the values are given with respect to each item in
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  the list $emph v1,v2,...$emphend. <p>
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  The function $emph fn$emphend should use the variable $emph last$emphend
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  to indicate the value of the previous recursion step.
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  And the starting value can be put into the WIMS variable
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  <tt>$$recursion_start</tt>.
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  </p>