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<h4 class="subsection">D.12.2 <code>mtwist</code> exceptions</h4>

     <ul>
<li><code>&lt;'memory overflow'&gt;</code> can be returned if there is insufficient
memory to allocate a result. 
<li>Messages of <code>&lt;'missing value'&gt;</code> and <code>&lt;'invalid value'&gt;</code> can
be returned if any floating point argument is <code>nil</code> or is not a
valid floating point number, unless there is a designated default
interpretation for <code>nil</code> as in <code>bern</code> and <code>u_cont</code>. 
<li>A message of <code>&lt;'bad mtwist specification'&gt;</code> is returned if an
argument to the <code>bern</code> function is not in the range of 0 to 1, or
if any probability passed to the <code>w_</code>* functions is negative. 
<li>A message of <code>&lt;'draw from empty list'&gt;</code> is returned if
an argument to the *<code>_enum</code> functions is <code>nil</code>
or if an argument to <code>w_enum</code> contains <code>nil</code>. 
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