diff --git a/day15/common.py b/day15/common.py
index a42b0a6..168c724 100644
--- a/day15/common.py
+++ b/day15/common.py
@@ -9,12 +9,12 @@ def yield_numbers(line: str, target: int):
         nums[last_spoken] = turn
         turn += 1
         last_spoken = starting
-        yield turn, last_spoken
+        yield turn, last_spoken, nums
     for t in range(turn, target):
         n = t - nums[last_spoken] if last_spoken in nums else 0
         nums[last_spoken] = t
         last_spoken = n
-        yield t+1, last_spoken
+        yield t+1, last_spoken, nums
 
 
 def get_target(line: str, target: int):
diff --git a/day15/part1.py b/day15/part1.py
index 5633b79..e7aa285 100644
--- a/day15/part1.py
+++ b/day15/part1.py
@@ -6,5 +6,5 @@ lines = (x.strip() for x in open("input.txt"))
 
 for line in lines:
     print(line)
-    last_spoken = get_target(line, 2020)
+    last_spoken = get_target(line, 2020)[1]
     print("->", last_spoken)
diff --git a/day15/part2.py b/day15/part2.py
index 62ec9f3..917bbf9 100644
--- a/day15/part2.py
+++ b/day15/part2.py
@@ -6,5 +6,5 @@ lines = (x.strip() for x in open("input.txt"))
 
 for line in lines:
     print(line)
-    last_spoken = get_target(line, 30000000)
+    last_spoken = get_target(line, 30000000)[1]
     print("->", last_spoken)
diff --git a/day15/visualize.py b/day15/visualize.py
new file mode 100644
index 0000000..2d847a0
--- /dev/null
+++ b/day15/visualize.py
@@ -0,0 +1,22 @@
+from day15.common import yield_numbers
+from matplotlib import pyplot as plt
+import numpy as np
+
+data = list(map(lambda x: (x[1],len(x[2]),len(x[2])/x[0]), yield_numbers("0,3,6", 30000000)))
+data = np.array(data)
+
+plt.plot(
+    data[:,:2],
+    linestyle='none',
+    marker='.',
+    markersize=1
+)
+plt.show()
+plt.plot(
+    data[:,2],
+    linestyle='none',
+    marker='.',
+    markersize=1,
+    color='g'
+)
+plt.show()