$generator1 = $generator1->current();
        $generator2 = $generator2->current();
        $generator3 = $generator3->current();
        $generator4 = $generator4->current();

        $generator1 = $generator1->current();
        $generator2 = $generator2->current();
        $generator3 = $generator3->current();
        $generator4 = $generator4->current();

        $generator1 = $generator1->current();
        $generator2 = $generator2->current();
        $generator3 = $generator3->current();
        $generator4 = $generator4->current();

        $generator3 = $generator3->current();
        $generator4 = $generator4->current();