diff --git a/06/06.py b/06/06.py
index 3a8e89f..3475352 100644
--- a/06/06.py
+++ b/06/06.py
@@ -6,18 +6,17 @@ def readFish():
 		return np.array(file.read().split(","), dtype=np.uint8)
 
 
-def getCount(fish, daysLeft, usedList, usedMap):
+def getCount(fish, daysLeft, usedMap):
 	if daysLeft <= fish:
 		return 1
 
-	if usedList[fish][daysLeft]:
+	if (fish, daysLeft) in usedMap:
 		return usedMap[(fish, daysLeft)]
 
 	count = 1
 	for d in range(0, daysLeft - fish, 7):
-		count += getCount(9, daysLeft - fish - d, usedList, usedMap)
+		count += getCount(9, daysLeft - fish - d, usedMap)
 
-	usedList[fish][daysLeft] = True
 	usedMap[(fish, daysLeft)] = count
 
 	return count
@@ -27,21 +26,11 @@ def solve(days):
 
 	# need to save/read known results for performance
 	usedMap = {}
-	usedList = np.zeros((10, days + 1), bool)
 
 	fish = readFish()
 	count = 0
 	for f in fish:
-		count += getCount(f, days, usedList, usedMap)
-
-	# numpy version too slow for part 2
-	# for i in range(days):
-	# 	decrease = fish > 0
-	# 	zeros = fish == 0
-	# 	fish[decrease] -= 1
-	# 	fish[zeros] = 6
-	# 	fish = np.concatenate((fish, zeros[zeros].astype(np.uint8) * 8))
-	# 	print(i, len(fish))
+		count += getCount(f, days, usedMap)
 
 	return count