diff --git a/three.py b/three.py
index 0eeee0a..72086ca 100755
--- a/three.py
+++ b/three.py
@@ -2,20 +2,15 @@
 from useful import *
 
 def stuff(l):
-    d = {x: True for x in l[:len(l)//2]}
-    return next(x for x in l[len(l)//2:] if d.get(x))
+    return next(iter(set(l[:len(l)//2]) & set(l[len(l)//2:])))
 
 def points(c):
     o = ord(c)
     return 27 + o - ord('A') if o < ord('a') else 1 + o - ord('a')
 
 def twuff(trip):
-    d = [{x: True for x in l} for l in trip[:2]]
-    return next(c for c in trip[2] if c in d[0] and c in d[1])
-
-def trips(ls):
-    return [[ls[i], ls[i+1], ls[i+2]] for i in range(0, len(ls), 3)]
+    return next(iter(reduce(lambda a, b: a & b, (set(l) for l in trip))))
 
 ls = lines(open(0))
 print(sum(points(stuff(l)) for l in ls))
-print(sum(points(twuff(l)) for l in trips(ls)))
+print(sum(points(twuff(l)) for l in batched(ls, 3)))