
var input:String = "a, b, c";


var words:Array = input.split(", ");

var max:String = "";

var maxD:String = (words.length  1).toString();

for (var i:int = 0; i<words.length; i++){

max += maxD;

}

var maxInt:int = parseInt(max,words.length);


for(i = 0; i<=maxInt; i++){

var indices:String = i.toString(words.length);

var r:String = "";

var k:int=0;

for (var j:int = 0; j<indices.length; j++){

r += words[parseInt(indices.charAt(j))] +" ";

k++;

}

while(k <words.length) {

r = words[0] +" "+ r;

k++;

}

trace(r);

}

trace(i, " variations");
Like many things on this site, I coded this rather quickly and it can probably be cleaned up...
Setting the input variable of the above snippet to "a, b" will output:
a a
a b
b a
b b
4 variations
Setting the input to "a, b, c" will output:
a a a
a a b
a a c
a b a
a b b
a b c
a c a
a c b
a c c
b a a
b a b
b a c
b b a
b b b
b b c
b c a
b c b
b c c
c a a
c a b
c a c
c b a
c b b
c b c
c c a
c c b
c c c
27 variations
I created this to work with words... inputs like "bread, breath, blobs, backwards". Be careful because you can quickly get millions of outputs:
1 to the power of 1 is 1
2 to the power of 2 is 4
3 to the power of 3 is 27
4 to the power of 4 is 256
5 to the power of 5 is 3125
6 to the power of 6 is 46,656
7 to the power of 7 is 823,543
8 to the power of 8 is 16,777,216
etc...