n><span class="op">(</span>na <span class="op">=</span> <span class="cn">NULL</span><span class="op">)</span></span>
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<span><span class="fu">ft_simple</span><span class="op">(</span>na <span class="op">=</span> <span class="cn">NULL</span><span class="op">)</span></span>
<span></span>
<span><span class="fu">ft_strata</span><span class="op">(</span>na <span class="op">=</span> <span class="cn">NULL</span><span class="op">)</span></span>
<span></span>
<span><span class="fu">ft_ignore</span><span 