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In the diagram above, points A, B, C, D, and E represent the five teams
in a certain league in which each team must play each of the other teams
exactly once. The segments connecting pairs of points indicate that the
two corresponding teams have already played their game. The arrows on the
segments point to the teams that lost; the lack of an arrow on a segment
indicates that the game ended in a tie. After all games have been played,
which of the following could NOT be the percent of games played that ended in a tie?
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