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

2 files changed, 31 insertions, 0 deletions

diff --git a/prolog/problems/sets/diff_3/common.py b/prolog/problems/sets/diff_3/common.py
new file mode 100644
index 0000000..76b88ed
--- /dev/null
+++ b/prolog/problems/sets/diff_3/common.py
@@ -0,0 +1,19 @@
+id = 130
+group = 'sets'
+number = 37
+visible = True
+facts = None
+
+solution = '''\
+memb130(X, [X|_]).
+memb130(X, [_|T]) :-
+  memb130(X, T).
+
+diff([], _, []).
+diff([H|T], S2, [H|D]) :-
+  \+ memb130(H, S2),
+  diff(T, S2, D).
+diff([H|T], S2, D) :-
+  memb130(H, S2),
+  diff(T, S2, D).
+'''
diff --git a/prolog/problems/sets/diff_3/en.py b/prolog/problems/sets/diff_3/en.py
new file mode 100644
index 0000000..a2fc55d
--- /dev/null
+++ b/prolog/problems/sets/diff_3/en.py
@@ -0,0 +1,12 @@
+id = 130
+name = 'diff/3'
+slug = 'find the difference of two sets'
+
+description = '''\
+<p><code>diff(S1, S2, D)</code>: the list <code>D</code> contains all elements of <code>S1</code> that don't appear in <code>S2</code>, with no duplicates.</p>
+<pre>
+  ?- diff([2,3,5,1,7,9], [3,7,4,5,6], D).
+    D = [2,1,9].
+</pre>'''
+
+hint = {}