diff --git a/testing/numerics.py b/testing/numerics.py
new file mode 100644
index 0000000..ed0aa98
--- /dev/null
+++ b/testing/numerics.py
@@ -0,0 +1,12 @@
+import math
+
+def to_numeric(identifier):
+	return ((ord(identifier[:1]) - 1) * 255) + (ord(identifier[1:]) - 1)
+
+def to_identifier(numeric):
+	return chr(int(math.floor(numeric / 255) + 1)) + chr((numeric % 255) + 1)
+
+print to_identifier(to_numeric("aa"))
+print to_identifier(to_numeric("ab"))
+print to_identifier(to_numeric("ac"))
+print to_identifier(to_numeric("ad"))