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+# function
+
+Instead of providing a seed, which will be used to seed our [Mersenne Twister](https://en.wikipedia.org/wiki/Mersenne_twister),
+you can also specify an arbitrary function to generate random numbers which the
+rest of the library will utilize when generating everything else.
+
+A rather simple example, simply using Math.random() instead of our Mersenne Twister
+
+```js
+// Use Math.random() instead of our Mersenne Twister
+var chance = new Chance(Math.random);
+
+chance.address()
+=> '131 Asmun Pike'
+chance.address() 
+=> '261 Pawnaf Highway'
+```
+
+Chance will appear to work just the same, but have a different underlying random
+generator.
+
+This function should return any number between 0 and 1.