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When it can be made easy?
Our Finnish system has pre-voting arranged at a large number of post offices and other places (and consulates and such abroad). During the designated days (usually a week - 10 days) you show up at any "mail voting" place in the country, show your ID, fill in your ballot, seal it in an envelope and give it to the official who in your viewing seals that envelope into another envelope and put it into the pile. Then you sign a slip confirming that you have voted and you are done.
The easiness of it all has meant that since the requirement of giving a reason (which could be "I think I might be out of the county") was skipped (15-20 years ago) more and more people chose to "mail vote" since they can do that anywhere, whereas on election day you can only vote at your designated polling station.