26 lines
442 B
Python
26 lines
442 B
Python
import io
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import sys
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sys.stdin = io.StringIO('''4
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100 98
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42 32
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1000000000000000000 1
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41 40''')
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# 数论基础 唯一分解定理（算术基本定理）
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# x - n*p = y
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# 则 n*p = x - y = z
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# 大于1的整数就满足 可分解为任意素数乘积
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def fun(x, y):
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z = x - y
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return z > 1
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t = int(input())
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for _ in range(t):
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print('YES' if fun(*map(int, input().split())) else 'NO')
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if __name__ == '__main__':
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pass
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