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I might be dumb, but I try unsuccessfully to resolve following task: having 2 Cemeteries from my previous participation in Dark Skies I'm looking to get the other 4. To get drops for Great Seal I'll need 6 Halloween shops and to get them I'll need to tap on Black Wraiths, meanining I'll need many Aerosols (from neighbors' gifts) and enough Soul Nets. To get the Soul Nets I'll need to land a lot of (ghost) guest planes. After reaching however 60 (ghost) guest planes landed, 60 Black Wraiths banished and 1 Great Seal collected the event items will stop dropping - correct?

So the only way how to get more Cemeteries is not to collect any Great Seals until I get 4 collections?! Any other suggestions? Or I'm wrong in some of my assumption?