Solved by sk372021

#	Title	# Solved	Avg. Tries
1269	대칭 차집합	20,948	1.54
1264	Vowels STANDARD	14,268	1.86
1157	단어 공부	102,336	2.50
1008	A/B STANDARD	231,199	2.90
1001	A-B STANDARD	279,794	1.45
1000	A+B STANDARD	325,479	2.59

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