public static function traverse(from : int, to : int, depth : int, length : int) {
            output[depth++] = from;
            var i : int;

            if (from == to) {
                if (depth == length) {
                    if (doubles(output)) {
                        if (!found) {
                            found = true;
                            for (i = 0; i < depth; i++) {
                                path[tabIndex] = output[i];
                                tabIndex++;
                            }
                            return;
                        }
                    }
                }
            } else {
                var len : int = data.length;

                for (i = 0; i < len; i++) {
                    if (!data[i].used) {
                        data[i].used = 1;
                        if (from == data[i].value1) {
                            traverse(data[i].value2, to, depth, length);
                        } else if (from == data[i].value2) {
                            traverse(data[i].value1, to, depth, length);
                        }
                        data[i].used = 0;
                    }
                }
            }
        }