how many of the 20 largest cities in my country have I been to?
W-wa ✅
Kraków ✅
Wrocław ✅
Łódź ✅
Poznań ✅
Gdańsk ✅
Szczecin ❌
Lublin ✅
Bydgoszcz ❌
Białystok ✅
Katowice ✅
Gdynia ❌
Częstochowa ✅
Radom ✅
Rzeszów ❌
Toruń ✅
Sosnowiec ❌
Kielce ✅
Gliwice ❌
Olsztyn ❌