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-rw-r--r--prolog/problems/sets/diff_3/common.py2
-rw-r--r--prolog/problems/sets/diff_3/en.py2
2 files changed, 4 insertions, 0 deletions
diff --git a/prolog/problems/sets/diff_3/common.py b/prolog/problems/sets/diff_3/common.py
index 76b88ed..82a6fe9 100644
--- a/prolog/problems/sets/diff_3/common.py
+++ b/prolog/problems/sets/diff_3/common.py
@@ -1,3 +1,5 @@
+# coding=utf-8
+
id = 130
group = 'sets'
number = 37
diff --git a/prolog/problems/sets/diff_3/en.py b/prolog/problems/sets/diff_3/en.py
index a2fc55d..7ce6944 100644
--- a/prolog/problems/sets/diff_3/en.py
+++ b/prolog/problems/sets/diff_3/en.py
@@ -1,3 +1,5 @@
+# coding=utf-8
+
id = 130
name = 'diff/3'
slug = 'find the difference of two sets'