and</span> stimulus_desc</span><span> = </span></code><ol><li id="type-stimulus_desc.Periodic" class="def variant constructor anchored"><a href="#type-stimulus_desc.Periodic" class="anchor"></a><code><span>| </span><span><span class="constructor">Periodic</span> <span class="keyword">of</span> int * int * int</span></code></li><li id="type-stimulus_desc.Sporadic" class="def variant constructor anchored"><a href="#type-stimulus_desc.Sporadic" class="anchor"></a><code><span>| </span><span><span class="constru