(c) Formulate this assignment problem using LINGO'S modeling language (note that the model should be similar to the one for the transportation problem). Define sets, such as strokes, swimmers, and assignments (stroke-swimmer pairs). The only data in the data section should be the square cost matrix. Verify the optimal solution by comparing it with the one obtained in (b).

Stroke Carl Chris David Tony Ken Backstroke 37.7 32.9 33.8 37.0 35.4 Breaststroke 43.4 33.1 42.2 34.7 41.8 Butterfly 33.3 28.5 38.9 30.4 33.6 Freestyle 29.2 26.4 29.6 28.5 3