diff --git a/flipper.py b/flipper.py
index f8e5b14..9d06546 100755
--- a/flipper.py
+++ b/flipper.py
@@ -14,8 +14,6 @@ def flip(x, y):
 with open(argv[1]) as f:
     for line in f.readlines():
         l = list(map(int, line.split()))
-        if len(l) < 2:
-            continue
         x = l[0]
         for i in range(1, len(l)):
             x = flip(x, l[i])
diff --git a/nand.f b/nand.f
new file mode 100644
index 0000000..001e629
--- /dev/null
+++ b/nand.f
@@ -0,0 +1,4 @@
+0 0
+0 0 2
+0 2 1 3
+0 3