Exported all problems from the SQLite database into the new directory structure.

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diff --git a/prolog/problems/clp_fd/gcd_3/en.py b/prolog/problems/clp_fd/gcd_3/en.py
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+++ b/prolog/problems/clp_fd/gcd_3/en.py
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+id = 149
+name = 'gcd/3'
+slug = 'greatest common divisor'
+
+description = '''\
+<p><code>gcd(X, Y, GCD)</code>: <code>GCD</code> is the greatest common divisor of <code>X</code> and <code>Y</code>. Implement this predicate using constraints.</p>
+<p>Hint: try writing a predicate to find <em>all</em> common divisors of two numbers first.</p>
+<pre>
+  ?- gcd(36, 84, GCD).
+    GCD = 12.
+</pre>'''
+
+hint = {}