from turtle import *
left(90)
m =15
screensize(2000,2000)
tracer(0)
down()
for j in range(8):
    for j in range(4):
        fd(5*m)
        rt(30)
        fd(6*m)
        rt(150)
    rt(60)

penup()

for x in range (-20,20):
    for y in range (-20,20):
        setpos(x*m,y*m)
        dot(4,'blue')
done()