private void score(Decision decisionA, Decision decisionB) {
		if (decisionA == Decision.COOPERATE && decisionB == Decision.COOPERATE) {
			scoreA += 3;
			scoreB += 3;
		}
		if (decisionA == Decision.DEFECT && decisionB == Decision.COOPERATE) {
			scoreA += 5;
		}
		if (decisionB == Decision.DEFECT && decisionA == Decision.COOPERATE) {
			scoreB += 5;
		}
		if (decisionA == Decision.DEFECT && decisionB == Decision.DEFECT) {
			scoreA += 1;
			scoreB += 1;
		}
	}