caclulate every possible combination of n words up to x from a string

nGramr

var nGramr = {}
		nGramr.words = prompt('Whats the phrase?').split(' ');
		nGramr.wordlen = nGramr.words.length;
		nGramr.depth = prompt('Whats the n?');
		nGramr.results = 0;
		nGramr.grams = function(aWords) {
			var words = aWords;
			var depth = words.length;
			console.log(depth);
			_.each(nGramr.words, function(word) {
				if (words.indexOf(word) == -1) {
					console.log(words.join(' '), word);
					nGramr.results ++;
					var nextCall = words.slice(0);
					nextCall.push(word);
					if (depth < nGramr.depth - 1) nGramr.grams(nextCall);
				}
			});
		};
		
		_.each(nGramr.words, function(word) {
			nGramr.grams([word]);
		});
		console.log(nGramr.results + ' results');

because it took me 4 hours out of my weekend to realize i had to properly clone the words array before recursing... so i will never forget this lesson