Answer:
You may destroy the rock by pounding it with a hammer.
Pounding a Rock to Dust
You have a rock. You have a hammer. The size of the problem "destroy the rock" may be made smaller by applying the hammer to the rock.
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After applying the hammer, you now have several smaller problems. Each of these smaller problems may be solved by applying the hammer.
QUESTION 5:
When do you stop applying the hammer?