4 files changed, 9 insertions, 9 deletions
diff --git a/prolog/problems/lists/conc_3/common.py b/prolog/problems/lists/conc_3/common.py
index fd6fb9f..6efac47 100644
--- a/prolog/problems/lists/conc_3/common.py
+++ b/prolog/problems/lists/conc_3/common.py
@@ -16,11 +16,11 @@ conc([H|T], L2, [H|L]) :-
 '''
 
 test_cases = [
-    ('conc([j,b], [l], X)',
+    ('conc([j, b], [l], X)',
         [{'X': '[j, b, l]'}]),
-    ('conc([a,r,u,e], [c,f], X)',
+    ('conc([a, r, u, e], [c, f], X)',
         [{'X': '[a, r, u, e, c, f]'}]),
-    ('conc(X, [], [g,r])',
+    ('conc(X, [], [g, r])',
         [{'X': '[g, r]'}]),
     ('conc([], [], [])',
         [{}]),
diff --git a/prolog/problems/lists/count_3/common.py b/prolog/problems/lists/count_3/common.py
index 423bb1e..c257d66 100644
--- a/prolog/problems/lists/count_3/common.py
+++ b/prolog/problems/lists/count_3/common.py
@@ -22,11 +22,11 @@ count(X, [Y|T], NT) :-
 test_cases = [
     ('count(a, [], X)',
         [{'X': '0'}]),
-    ('count(r, [a,r,b,c,r], X)',
+    ('count(r, [a, r, b, c, r], X)',
         [{'X': '2'}]),
-    ('count(l, [l,l,l,1,2,3], X)',
+    ('count(l, [l, l, l, 1, 2, 3], X)',
         [{'X': '3'}]),
-    ('count(z, [a,b,c,z,z], X)',
+    ('count(z, [a, b, c, z, z], X)',
         [{'X': '2'}]),
 ]
 
diff --git a/prolog/problems/lists/del_3/common.py b/prolog/problems/lists/del_3/common.py
index cf458b1..5e00f4d 100644
--- a/prolog/problems/lists/del_3/common.py
+++ b/prolog/problems/lists/del_3/common.py
@@ -18,9 +18,9 @@ del(X, [Y|T], [Y|L]) :-
 test_cases = [
     ('del(1, [1], X)',
         [{'X': '[]'}]),
-    ('del(X, [t,e,g], [t,g])',
+    ('del(X, [t, e, g], [t, g])',
         [{'X': 'e'}]),
-    ('del(X, [Y,g,Z], [u,f])',
+    ('del(X, [Y, g, Z], [u, f])',
         [{'X': 'g', 'Y': 'u', 'Z': 'f'}]),
 ]
 
diff --git a/prolog/problems/lists/memb_2/common.py b/prolog/problems/lists/memb_2/common.py
index 0704a50..30a6dfd 100644
--- a/prolog/problems/lists/memb_2/common.py
+++ b/prolog/problems/lists/memb_2/common.py
@@ -18,7 +18,7 @@ memb(X, [_|T]) :-
 test_cases = [
     ('memb(c, [X])',
         [{'X': 'c'}]),
-    ('memb(X, [y,l,r,g,a])',
+    ('memb(X, [y, l, r, g, a])',
         [{'X': 'y'}, {'X': 'l'}, {'X': 'r'}, {'X': 'g'}, {'X': 'a'}]),
 ]