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As I understand it, the catch is that the problem doesn't state that everyone needs to cross the border. But it also doesn't say that exactly three people need to do it.
The cart is only mentioned in the context of the canvases, and since they don't need to be carried, why is it mandatory?
Added 1 minute ago
I'll post the video when I wake up, and I'll upload the masquerade in a lighter version (as Medj suggested) in the evening.