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"It is important that legislation does not unduly prohibit spending and political expression before the official start of the campaign, since the free exchange of ideas, especially political ideas, should always be allowed. However, it is possible to set certain specific limitations, provided that these are reasonable and proportionate to the objective of a fair electoral campaign. This may include prohibitions on leafleting or direct calls to voters that ask them to vote for a specific party before a given date."
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