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event-based-effects × 212safety × 39
usa × 30
air-travel × 22
covid-19 × 21
trains × 14
public-transport × 12
health × 11
visas × 10
uk × 9
schengen × 8
india × 8
borders × 8
customs-and-immigration × 7
germany × 7
france × 7
japan × 7
cancellations × 7
tickets × 6
ukraine × 6
us-citizens × 5
online-resources × 5
china × 5
airlines × 5
driving × 5
