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BIG-Bench Extra Hard (BBEH) / You will be given a main question and two sub-questions. Each question comes…

Problem

Answer published by the source. Consult the official source to check your work against its answer.

input

You will be given a main question and two sub-questions. Each question comes with multiple choices you can select from. For each question, select all the correct choices.

Main Question:  How can a player effectively execute a rally strategy in a table tennis game to keep their opponent on the defensive and increase their own scoring opportunities?  A) Consistently hitting the ball to the opponent's weak side. B) Mixing up the speed and spin of the ball to disrupt the opponent's rhythm. C) Always aiming for the corners of the table. D) Keeping the ball low and close to the net.
Sub-Question 1:  What are effective ways to keep the opponent on the defensive during a table tennis rally?  A) Targeting the opponent's weak side with powerful shots. B) Frequently changing the direction of the ball. C) Always serving with maximum power. D) Using a variety of spins and speeds to disrupt the opponent's timing.
Sub-Question 2:  What tactics can a player employ to increase their own scoring opportunities during a table tennis rally?  A) Consistently hitting deep shots to push the opponent back. B) Mixing up the speed and spin of the ball to force errors. C) Always serving with maximum spin. D) Aiming for the corners of the table to limit the opponent's return options.

For each question, provide the answer as a concatenation of the correct choices.
Separate the answers for the questions by comma.
For example, if the correct choices for the main question are A and C, for the first sub-question is D and for the second sub-question are B and D, your final answer must be "AC, D, BD".

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