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  <dt><pre><a href="readfx.html#Interval"><span class="Identifier">Interval</span></a><span class="Other">[</span><span class="Identifier">S</span><span class="Other">;</span> <span class="Identifier">T</span><span class="Other">]</span> <span class="Other">=</span> <span class="Keyword">tuple</span><span class="Other">[</span><span class="Identifier">st</span><span class="Other">,</span> <span class="Identifier">en</span><span class="Other">:</span> <span c