void setup(){
size(800,600);
background(#EA0E42);
}
void draw(){
fill(0,255,0); rect(0,0,100,100);
fill(0,0,255); rect(0,100,100,100);
fill(255,255,0); rect(0,200,100,100);
}
void mouseDragged(){
line(mouseX, mouseY, pmouseX, pmouseY);
}
void mousePressed(){
if(mouseX<100 && mouseY<100){stroke(0,255,0);}
else if(mouseX<100 && mouseY<200){stroke(0,0,255);}
else if(mouseX<100 && mouseY<300){stroke(255,255,0);}
}e

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