1 files changed, 23 insertions, 0 deletions
diff --git a/prolog/problems/license_plates/genexp_2/common.py b/prolog/problems/license_plates/genexp_2/common.py
new file mode 100644
index 0000000..a91c392
--- /dev/null
+++ b/prolog/problems/license_plates/genexp_2/common.py
@@ -0,0 +1,23 @@
+id = 146
+group = 'license_plates'
+number = 53
+visible = True
+facts = None
+
+solution = '''\
+memb146(X, [X|_]).
+memb146(X, [_|T]) :-
+  memb146(X, T).
+
+conc146([], L, L).
+conc146([H|T], L2, [H|L]) :-
+  conc146(T, L2, L).
+
+genexp([Exp], Exp).
+genexp(L, Exp) :-
+  conc146(Before, [N1,N2|After], L),
+  memb146(Op, ['+','-','*','/']),
+  NExp =.. [Op, N1, N2],
+  conc146(Before, [NExp|After], L1),
+  genexp(L1, Exp).
+'''