CAIRO: Egypt's benchmark stock index sank over 4 percent on Monday as a bout of profit-taking in market heavyweights such as Orascom Telecom cut short a four-day rally ahead of a long Muslim holiday. Shares in the regional mobile operator shed 7.35 percent to last trade at LE 23.70 ($4.30). Orascom Construction Industries, Egypt's largest listed builder, lost 6.34 percent to LE 121.90. Overall, the benchmark CASE 30 index dropped 4.36 percent to 4,022.58 points while the rival Hermes index...