internal TragedyCalculator(Performance aPerformance, Play aPlay) : base(aPerformance, aPlay) { }
internal EnrichedPerformance(Performance aPerformance, Play play) : base(aPerformance.PlayId, aPerformance.Audience) { Play = play; }
internal PerformanceCalculator(Performance aPerformance, Play aPlay) { Performance = aPerformance; Play = aPlay; }