question: Describe the rules of tennis in exactly 3 sentences, ensuring that the letter "e" appears at least 10 times in total. Include 2 placeholders in your explanation, marked as [PLACEHOLDER1] and [PLACEHOLDER2].
answer: Tennis is a sport in which players aim to hit a ball over a net into the opponent's court, trying to score points by making sure the ball lands within the boundaries. Each match is divided into sets, and players must win a certain number of games within these sets to triumph; [PLACEHOLDER1] describes this scoring format. The server must alternate sides after each point, and [PLACEHOLDER2] details the rules for serving and faults in this game.