integer i, h, j, w;
file f;

w = 640;
h = 320;

f.create("out.ppm", 00644);
f.form("P6\n~ ~\n255\n", w, h);

j = 0;
do {
    srand(j >> 4);
    i = 0;
    do {
        16.times(f_bytes, f, drand(255), drand(255), drand(255));
    } while ((i += 16) < w);
} while ((j += 1) < h);