$v1 = 1;
        ksort($this->_vendors);
        $combinations = array();

        foreach ($this->_vendors as $val) {

            for ($v2 = $v1; $v2 < sizeof($this->_vendors); $v2++) {

                if (isset($this->_vendors[$v2 + 1])) {

                    $this->_updateCombinations(
                        array($v1, $v2 + 1),
                        $val,
                        $combinations
                    );
                }

                if (sizeof($this->_vendors) > 3) {

                    for ($v3 = $v2; $v3 < sizeof($this->_vendors); $v3++) {

                        if (isset($this->_vendors[$v3 + 2])) {

                            $this->_updateCombinations(
                                array($v1, $v2 + 1, $v3 + 2),
                                $val,
                                $combinations
                            );
                        }

                        if (sizeof($this->_vendors) > 4) {

                            for ($v4 = $v3; $v4 < sizeof($this->_vendors); $v4++) {

                                if (isset($this->_vendors[$v4 + 3])) {

                                    $this->_updateCombinations(
                                        array($v1, $v2 + 1, $v3 + 2, $v4 + 3),
                                        $val,
                                        $combinations
                                    );
                                }

                                if (sizeof($this->_vendors) > 5) {

                                    for ($v5 = $v4; $v5 < sizeof($this->_vendors); $v5++) {

                                        if (isset($this->_vendors[$v5 + 3])) {

                                            $this->_updateCombinations(
                                                array($v1, $v2 + 1, $v3 + 2, $v4 + 3, $v5 + 3),
                                                $val,
                                                $combinations
                                            );
                                        }
                                    }
                                }
                            }
                        }
                    }
                }
            }
            $v1++;
        }