a sports field has a square shape. poles with the letters M, A, T, H are located at the corners of the square ( see the diagram
). During warm up, a students starts at any pole, runs to another pole along a side of the square, then runs to another pole along a side of the square, and so on. the student cannot repeat a run along the same side of the square in the same direction. For instance, she cannot run from M to A twice, but she can run from M to A and at some point from A to M. How many different ways are there to complete the warm up that includes all eight possible runs (see the diagram)? One possible way is M-A-T-H-M-H-T-A-M
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