Question: Implement a new method for the bag class from Section 4.4. The new method allows you to subtract the contents of one bag from another.

Implement a new method for the bag class from Section 4.4. The new method allows you to subtract the contents of one bag from another. For example, suppose x has seven copies of the number 3 and y has two copies of the number 3. Then, after activating x.subtract(y), the bag x will have five remaining copies of the number 3.

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