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Codeforces Round #705 (Div. 2) A
Codeforces, 2021. 3. 7. 02:00

Educational Codeforces Round 105 (Rated for Div. 2) A
Codeforces, 2021. 3. 3. 23:54

Codeforces Round #670 (Div. 2) A
Codeforces, 2020. 9. 13. 13:17