guide a;
for (int i = 0; i < 1e7; ++i)
{
 picture pic;
 size(pic,10cm,20cm);
 path p=(1.0,2.0);
 path q=(3.0,4.0);
 path a=p..q..(3,5);
 draw(pic,a,blue+dashed);
 shipout("out/",pic);
}