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void setup () {
size(255,255);
}
void draw () {
for (int i=0; i<height; i = i + 20) {
stroke(0,0,0);
line(0, i, width, i);
}
for (int v = 0; v<width; v = v + 20) {
stroke(0,0,0);
line(v, 0, v, height);
}
}