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!! +exec+ +vardef+
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$lst_tit bound$lst_titend$type_exec
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  $(lst_syntax)bound $emph vname$emphend between [integer]
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  $emph v1$emphend and $emph v2$emphend [default $emph defaultvalue$emphend]
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  </span> <br/>or<br/><span class="tt">
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  $!bound $emph vname$emphend within $emph list$emphend [default
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  $emph defaultvalue$emphend]</span>
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  $lst_mean bound the range of the variable $emph vname$emphend. Usually
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  this is used on user-submitted variables. <br/>
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  The first syntax is usually for numerical variables (integer or real,
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  defaults to real). In this case $emph v1$emphend and $emph v2$emphend
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  supplies the lower and upper bounds for the value of $emph
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  vname$emphend. <br/>
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  In the second syntax, the value of $emph vname $emphend is compared with
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  each item of $emph list$emphend. If no occurrence is found, the value of
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  $emph vname$emphend is replaced either by $emph defaultvalue$emphend or
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  the first item of $emph list$emphend, according to whether $emph
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  defaultvalue$emphend is defined. <br/>
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  In any case, $emph defaultvalue$emphend is optional.