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1. IntStream.range returns a sequential ordered IntStream from startInclusive (inclusive) to endExclusive (exclusive) by an incremental step of 1. Therefore, is1 contains 1, 2.
2. IntStream.range returns a sequential ordered IntStream from startInclusive (inclusive) to endInclusive (inclusive) by an incremental step of 1. Therefore, is2 contains 1, 2, 3.