Loading AMD modules using Dojo

gistfile1.js

// This doesn't work.... 

define("a/b/c", function () {
	// return something....
});

var mod = require("a/b/c");

// This does work...

define("a/b/c", function () {
	// return something....
});

require(["a/b/c"], function () {
	var mod = require("a/b/c");
});

// or 

define("a/b/c", function () {
	// return something....
});

require(["a/b/c"]);
var mod = require("a/b/c");