For one part of exercise I need to count how many areas there are:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
15
Vilnius Vilniaus 541278
Dusetos Utenos 4211
Alytus Alytaus 69859
Druskininkai Alytaus 16890
Ignalina Utenos 6307
Kavarskas Utenos 753
Lazdijai Alytaus 5027
Simnas Alytaus 1940
Trakai Vilniaus 5504
Utena Utenos 33086
Veisiejai Alytaus 1673
Vievis Vilniaus 5246
Lentvaris Vilniaus 11832
Visaginas Utenos 28438
Zarasai Utenos 8001
Basically I have to count how many unique areas there are from the second block. The answer should be: Vilnius, Utenos, Alytaus - so 3. I know how count how many times each area appears, but I can't figure out how to do what they are asking of me. Keep it beginner friendly if possible.