**TI83F* Program file 09/22/03, 20:45l [MIDPOINT[Yá?Ü*X1>*+A?Ü*Y1>*+C?Ü*X2>*+B?Ü*Y2>*+D?á?Þ**?BpAƒ2E?DpCƒ2Z?Þ*X)IS*?ÞE?Þ*Y)IS*?ÞZ|