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---
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layout: default
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title: "Generating"
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parent: Normal
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ancestor: Funcons-beta
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---
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[Funcons-beta] : [Generating.cbs]
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-----------------------------
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### Generating
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<div class="highlighter-rouge"><pre class="highlight"><code>[
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<i class="keyword">Type</i> <span class="name"><a href="#Name_atoms">atoms</a></span>
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<i class="keyword">Entity</i> <span class="name"><a href="#Name_used-atom-set">used-atom-set</a></span>
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<i class="keyword">Funcon</i> <span class="name"><a href="#Name_initialise-generating">initialise-generating</a></span>
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<i class="keyword">Funcon</i> <span class="name"><a href="#Name_fresh-atom">fresh-atom</a></span>
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<i class="keyword">Funcon</i> <span class="name"><a href="#Name_use-atom-not-in">use-atom-not-in</a></span>
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]</code></pre></div>
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<div class="highlighter-rouge"><pre class="highlight"><code><i class="keyword">Meta-variables</i>
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<span id="PartVariable_T"><i class="var">T</i></span> <: <span class="name"><a href="../../../Values/Value-Types/index.html#Name_values">values</a></span></code></pre></div>
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<div class="highlighter-rouge"><pre class="highlight"><code><i class="keyword">Built-in</i> <i class="keyword">Type</i>
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<span class="name"><span id="Name_atoms">atoms</span></span></code></pre></div>
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<code><span class="name"><a href="#Name_atoms">atoms</a></span></code> is the type of values used as distinguishable tags.
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Notation for individual atoms is not provided.
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<div class="highlighter-rouge"><pre class="highlight"><code><i class="keyword">Entity</i>
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< _ , <span class="ent-name"><span id="Name_used-atom-set">used-atom-set</span></span>(_:<span class="name"><a href="../../../Values/Composite/Sets/index.html#Name_sets">sets</a></span>(<span class="name"><a href="#Name_atoms">atoms</a></span>)) > ---> < _ , <span class="ent-name">used-atom-set</span>(_:<span class="name">sets</span>(<span class="name">atoms</span>)) ></code></pre></div>
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<div class="highlighter-rouge"><pre class="highlight"><code><i class="keyword">Built-in</i> <i class="keyword">Funcon</i>
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<span class="name"><span id="Name_initialise-generating">initialise-generating</span></span>(_:=><span id="Variable108_T"><i class="var">T</i></span>) : =><span id="Variable123_T"><i class="var">T</i></span></code></pre></div>
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The initial value of the <code><span class="name"><a href="#Name_used-atom-set">used-atom-set</a></span>(<i class="var">SA</i>)</code> entity is unspecified. It could
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contains atoms that are reserved for internal use.
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<div class="highlighter-rouge"><pre class="highlight"><code><i class="keyword">Funcon</i>
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<span class="name"><span id="Name_fresh-atom">fresh-atom</span></span> : =><span class="name"><a href="#Name_atoms">atoms</a></span></code></pre></div>
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<code><span class="name"><a href="#Name_fresh-atom">fresh-atom</a></span></code> computes an atom distinct from all previously computed atoms.
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<div class="highlighter-rouge"><pre class="highlight"><code><i class="keyword">Rule</i>
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<span class="name"><a href="../../../Values/Composite/Sets/index.html#Name_element-not-in">element-not-in</a></span>(<span class="name"><a href="#Name_atoms">atoms</a></span>, <a href="#Variable211_SA"><i class="var">SA</i></a>) ~> <span id="Variable197_A"><i class="var">A</i></span>
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-----------------------------------------------
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< <span class="name"><a href="#Name_fresh-atom">fresh-atom</a></span> , <span class="ent-name"><a href="#Name_used-atom-set">used-atom-set</a></span>(<span id="Variable211_SA"><i class="var">SA</i></span>) >
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---> < <a href="#Variable197_A"><i class="var">A</i></a> , <span class="ent-name"><a href="#Name_used-atom-set">used-atom-set</a></span>(<span class="name"><a href="../../../Values/Composite/Sets/index.html#Name_set-insert">set-insert</a></span>(<a href="#Variable197_A"><i class="var">A</i></a>, <a href="#Variable211_SA"><i class="var">SA</i></a>)) ></code></pre></div>
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<div class="highlighter-rouge"><pre class="highlight"><code><i class="keyword">Funcon</i>
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<span class="name"><span id="Name_use-atom-not-in">use-atom-not-in</span></span>(_:<span class="name"><a href="../../../Values/Composite/Sets/index.html#Name_sets">sets</a></span>(<span class="name"><a href="#Name_atoms">atoms</a></span>)) : =><span class="name"><a href="#Name_atoms">atoms</a></span></code></pre></div>
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<code><span class="name"><a href="#Name_use-atom-not-in">use-atom-not-in</a></span>(<i class="var">SA</i>)</code> computes an atom not in the set <code><i class="var">SA</i></code>, and inserts it
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in the <code><span class="name"><a href="#Name_used-atom-set">used-atom-set</a></span>(<i class="var">SA′</i>)</code> entity, in case it was not previously used.
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<div class="highlighter-rouge"><pre class="highlight"><code><i class="keyword">Rule</i>
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<span class="name"><a href="../../../Values/Composite/Sets/index.html#Name_element-not-in">element-not-in</a></span>(<span class="name"><a href="#Name_atoms">atoms</a></span>, <a href="#Variable379_SA"><i class="var">SA</i></a>) ~> <span id="Variable367_A"><i class="var">A</i></span>
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--------------------------------------------------------
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< <span class="name"><a href="#Name_use-atom-not-in">use-atom-not-in</a></span>(<span id="Variable379_SA"><i class="var">SA</i></span>:<span class="name"><a href="../../../Values/Composite/Sets/index.html#Name_sets">sets</a></span>(<span class="name"><a href="#Name_atoms">atoms</a></span>)) , <span class="ent-name"><a href="#Name_used-atom-set">used-atom-set</a></span>(<span id="Variable402_SA'"><i class="var">SA′</i></span>) >
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---> < <a href="#Variable367_A"><i class="var">A</i></a> , <span class="ent-name"><a href="#Name_used-atom-set">used-atom-set</a></span>(<span class="name"><a href="../../../Values/Composite/Sets/index.html#Name_set-insert">set-insert</a></span>(<a href="#Variable367_A"><i class="var">A</i></a>, <a href="#Variable402_SA'"><i class="var">SA′</i></a>)) ></code></pre></div>
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____
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From the [PLanCompS Project] | [CBS-beta issues...] | [Suggest an improvement...]
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[Generating.cbs]: Generating.cbs
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"CBS SOURCE FILE"
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[Funcons-beta]: /CBS-beta/docs/Funcons-beta
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"FUNCONS-BETA"
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[Unstable-Funcons-beta]: /CBS-beta/docs/Unstable-Funcons-beta
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"UNSTABLE-FUNCONS-BETA"
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[Languages-beta]: /CBS-beta/docs/Languages-beta
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"LANGUAGES-BETA"
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[Unstable-Languages-beta]: /CBS-beta/docs/Unstable-Languages-beta
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"UNSTABLE-LANGUAGES-BETA"
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[CBS-beta]: /CBS-beta "CBS-BETA"
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[PLanCompS Project]: https://plancomps.github.io
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"PROGRAMMING LANGUAGE COMPONENTS AND SPECIFICATIONS PROJECT HOME PAGE"
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[CBS-beta issues...]: https://github.com/plancomps/CBS-beta/issues
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"CBS-BETA ISSUE REPORTS ON GITHUB"
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[Suggest an improvement...]: mailto:plancomps@gmail.com?Subject=CBS-beta%20-%20comment&Body=Re%3A%20CBS-beta%20specification%20at%20Computations/Normal/Generating/Generating.cbs%0A%0AComment/Query/Issue/Suggestion%3A%0A%0A%0ASignature%3A%0A
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"GENERATE AN EMAIL TEMPLATE"
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