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No, because between 307 and 317 there are two other prime numbers.
Please read the description again, that exact case is explained there.
The test with [300,400] with a gap of 10, there is a pair before 337, and it's 307 and 317
The test with [100,110] with a gap of six, the reuslt isn't null, beacause there is the pair [101,107]