SARAH DINGUS, Ponca City unattached swimmer, competed in the Summer Sizzler Swim Meet in Derby, Kan., last weekend. She placed first in the 50 meter Freestyle, 50 Butterfly, 100 Breaststroke and 200 Breaststroke. In addition, she was second in the 200 Individual Medley and the 400 Individual Medley, third in the 200 Butterfly, fourth in the 200 Backstroke and fifth in the 400 Freestyle. For her…