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In page Northern Ireland:

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Elections to the Northern Ireland Assembly are by single transferable vote with five Members of the Legislative Assembly (MLAs) elected from each of 18 parliamentary constituencies.[3] In addition, eighteen representatives (Members of Parliament, MPs) are elected to the lower house of the UK parliament from the same constituencies using the first-past-the-post system.[4] However, not all of those elected take their seats. Sinn Féin MPs, currently seven,[5] refuse to take the oath to serve the King that is required before MPs are allowed to take their seats.[6][7] In addition, the upper house of the UK parliament, the House of Lords, currently has some 25 appointed members from Northern Ireland.[citation needed]