function mokou_wander(self)
    local x, other_x, y, h, accel = {}, {475}, 0, 120, 30
    for i=325,450,25 do other_x[#other_x+1] = i x[#x+1] = i+12.5 end
    local xx, yy, r, theta, first_bit, second_bit, third_bit
    first_bit = function(self)
        xx = x[random(#x)]
        yy = random(h) + y
        r, theta = get_polar(xx-self.x, yy-self.y)
        self:change_speed(r/accel, accel)
        self:change_direction(theta, 1)
        return accel, second_bit
    end
    second_bit = function(self)
        self:change_speed(0, accel)
        return accel, third_bit
    end
    third_bit = function(self)
        x, other_x = other_x, x
        return max(120-45*rank, 0), first_bit
    end
    return max(120-45*rank, 0), first_bit
end