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import annotate; settings.outformat="pdf"; size(200); draw(unitcircle); dot((0,0)); annotate("O","(0,0)",(0,0)); annotate("A","(1,0)",(1,0)); annotate("B","(0,1)",(0,1)); annotate("C","(-1,0)",(-1,0)); annotate("D","(0,-1)",(0,-1));