作業四

size 300 300
FAST
Repeat A 0 100
{
pen A
line A 0 A 300
}


Repeat A 75 175
{
pen (A-50)
line A 0 A 300
}

Repeat A 150 250
{
pen (A-100)
line A 0 A 300
}

Repeat A 225 300
{
pen (A-175)
line A 0 A 300
}