 Complete the following phrase:  Entering her thirties, the 1981 season proved to be the high point of Sorokinas career. She won an 800 m1500 m double at the Soviet Indoor Championships. She set personal bests in both events outdoors, running 1:57.55 minutes for the 800 m in August and 3.58.89 minutes for the 1500 m  both these times ranked her fourth in the world for the season. She was the Soviet representative in the 1500 m at the 