Algorithm/luogu/njit-baidu2023/tb.py

import io
import sys

sys.stdin = io.StringIO('''4
100 98
42 32
1000000000000000000 1
41 40''')


# 数论基础 唯一分解定理（算术基本定理）
# x - n*p = y
# 则 n*p = x - y = z
# 大于1的整数就满足 可分解为任意素数乘积
def fun(x, y):
    z = x - y
    return z > 1


t = int(input())
for _ in range(t):
    print('YES' if fun(*map(int, input().split())) else 'NO')

if __name__ == '__main__':
    pass