Question 932088
{{{drawing(300,300,-5,5,-7,3,grid(1),
blue(line(-1,-3,-1,-6)),
blue(line(-1,-3,0,-3)),
blue(line(-1,-6,0,-6)),
blue(line(0,-3,0,-6)),
green(circle(-1,-3,0.3)),
green(circle(-1,-6,0.3)),
green(circle(0,-3,0.3)),
green(circle(0,-6,0.3)))}}}
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(0,-3)