Question: exercise 5.4 why does the removeZeroCounts method use a while loop with an iterator ,instead of a for-each loop as used in the other methods?

exercise 5.4 why does the removeZeroCounts method use a while loop with an iterator ,instead of a for-each loop as used in the other methods? could it be written with a for-each loop? could the other methods be written using a while loop?

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