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UK
SMD
Mexico
Both SMD and PR
Plurality(First-Past-The-Post)
Russia
Both SMD and PR
Absolute majority(Two-Ballot System): A candidate must win more than 50% of the vote to win in the first round.
Nigeria
SMD
Plurality: least 25% of the vote in two-thirds (24 of 36) of the states
Iran
Mainly Multimember but SMD in certain districts
Absolute Majority a candidate must win more than 50% of the vote in the first round, or face a second-round runoff against the runner-up.
China
Indirect and controlled
The president is formally elected by the National People's Congress (NPC)