my @x = ($inc, $inc, $inc);
    my @y = ($inc, $inc, $inc);
    
    if (3 == counter (@x)) {
        printf "%d equals %d.\n", counter (@x), counter (@y);
    }
    
    do {
        my @x = (@x, $inc);
        
        if (3 == counter (@y)) {
           printf "%d equals %d.\n", counter (@x), counter (@y);
        }
    }