var arr:Array = [A,S,M,D,P,R];
var ar:Array = ["A","S","M","D","P","R"];
var end:Array = [];
var count:int = 0;

permute(0);
trace(end);
trace(count);

function permute(index:int):void {
    var i:int = 0;
    if (index == ar.length) {
        var res:Number = arr[arr.length-1].call(this,
                            arr[arr.length-2].call(this,
                                arr[arr.length-3].call(this,
                                    arr[arr.length-4].call(this,
                                        arr[arr.length-5].call(this,
                                            arr[0].call(this, 0))))));
        trace(ar.join("") + ": " + res);
        if (res == -2) end.push(ar.join(""));
        count++;
        return;
    }
    for (i = index; i < ar.length; i++) {
        swap(index, i);
        permute(index + 1);
        swap(index, i);
    }
}

function swap(a:int, b:int):void {
    var c = ar[a];
    ar[a] = ar[b];
    ar[b] = c;

    var d = arr[a];
    arr[a] = arr[b];
    arr[b] = d;
}


function A(n:Number):Number {
    return n+2;
}

function S(n:Number):Number {
    return n-2;
}

function M(n:Number):Number {
    return n*2;
}

function D(n:Number):Number {
    return n/2;
}

function P(n:Number):Number {
    return n*n;
}

function R(n:Number):Number {
    return Math.sqrt(n);
}