8 files changed, 2 insertions, 7 deletions
diff --git a/prolog/problems/sets/common.py b/prolog/problems/sets/common.py
new file mode 100644
index 0000000..104aa9d
--- /dev/null
+++ b/prolog/problems/sets/common.py
@@ -0,0 +1,2 @@
+id = 5
+number = 4
diff --git a/prolog/problems/sets/diff_3/en.py b/prolog/problems/sets/diff_3/en.py
index 7ce6944..47def00 100644
--- a/prolog/problems/sets/diff_3/en.py
+++ b/prolog/problems/sets/diff_3/en.py
@@ -1,6 +1,5 @@
 # coding=utf-8
 
-id = 130
 name = 'diff/3'
 slug = 'find the difference of two sets'
 
diff --git a/prolog/problems/sets/intersect_3/en.py b/prolog/problems/sets/intersect_3/en.py
index def0ab5..fed5e34 100644
--- a/prolog/problems/sets/intersect_3/en.py
+++ b/prolog/problems/sets/intersect_3/en.py
@@ -1,6 +1,5 @@
 # coding=utf-8
 
-id = 129
 name = 'intersect/3'
 slug = 'find the intersection of two sets'
 
diff --git a/prolog/problems/sets/is_subset_2/en.py b/prolog/problems/sets/is_subset_2/en.py
index b851d82..ad4804c 100644
--- a/prolog/problems/sets/is_subset_2/en.py
+++ b/prolog/problems/sets/is_subset_2/en.py
@@ -1,6 +1,5 @@
 # coding=utf-8
 
-id = 132
 name = 'is_subset/2'
 slug = 'check if one set is a subset of another'
 
diff --git a/prolog/problems/sets/is_superset_2/en.py b/prolog/problems/sets/is_superset_2/en.py
index 16b3db0..464762c 100644
--- a/prolog/problems/sets/is_superset_2/en.py
+++ b/prolog/problems/sets/is_superset_2/en.py
@@ -1,6 +1,5 @@
 # coding=utf-8
 
-id = 131
 name = 'is_superset/2'
 slug = 'check if one set is a superset of the other'
 
diff --git a/prolog/problems/sets/powerset_2/en.py b/prolog/problems/sets/powerset_2/en.py
index dcaee19..ad2fe87 100644
--- a/prolog/problems/sets/powerset_2/en.py
+++ b/prolog/problems/sets/powerset_2/en.py
@@ -1,6 +1,5 @@
 # coding=utf-8
 
-id = 134
 name = 'powerset/2'
 slug = 'find all subsets of a set'
 
diff --git a/prolog/problems/sets/subset_2/en.py b/prolog/problems/sets/subset_2/en.py
index 78c1362..eb96ac0 100644
--- a/prolog/problems/sets/subset_2/en.py
+++ b/prolog/problems/sets/subset_2/en.py
@@ -1,6 +1,5 @@
 # coding=utf-8
 
-id = 133
 name = 'subset/2'
 slug = 'generate all subsets of a set'
 
diff --git a/prolog/problems/sets/union_3/en.py b/prolog/problems/sets/union_3/en.py
index 1c9379e..db6bbd9 100644
--- a/prolog/problems/sets/union_3/en.py
+++ b/prolog/problems/sets/union_3/en.py
@@ -1,6 +1,5 @@
 # coding=utf-8
 
-id = 128
 name = 'union/3'
 slug = 'find the union of two sets'