diff --git a/data/mk5g.rb b/data/mk5g.rb
new file mode 100755
index 000000000..41aea233f
--- /dev/null
+++ b/data/mk5g.rb
@@ -0,0 +1,8 @@
+#!/usr/bin/env ruby
+
+5000000000.times do
+  u = rand < 0.5 ? 0 : 1
+  v = rand < 0.1 ? 0 : 1
+  puts "#{u} #{v}"
+end
+puts "3 5"