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Syntax: <tt>\\if{condition}{content1}{content2}</tt>
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Where <tt>condition</tt> is composed of testing conditions (using variables),
<tt>content1</tt> will be shown when the condition is true, otherwise
<tt>content2</tt> will be shown. The latter is optional.
\help{module=adm/doc&cmd=new&job=help&help_subject=if}
{List of conditions}.
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