diff --git a/04/d.py b/04/d.py
index 58c4d55..45d0d0b 100644
--- a/04/d.py
+++ b/04/d.py
@@ -7,20 +7,11 @@ tot1 = 0
 tot2 = 0
 
 for p in pairs:
-    a = p.split(",")
+    a = p.split(',')[0].split('-')
+    b = p.split(',')[1].split('-')
 
-    arrays = []
-
-    for i in range(0, len(a), 1):
-        b = a[i].split("-")
-
-        if b[0] == b[1]:
-            arrays.append([int(b[0])])
-            continue
-        arrays.append(range(int(b[0]), int(b[1])+1))
-
-    set_a = set(arrays[0])
-    set_b = set(arrays[1])
+    set_a = set(range(int(a[0]), int(a[1])+1))
+    set_b = set(range(int(b[0]), int(b[1])+1))
 
     if (set_a.issubset(set_b) or set_b.issubset(set_a)):
         tot1 += 1