The answer is bi-.
The prefix "bi-" means "two." It is used in words like "bicycle" (a vehicle with two wheels) and "bilingual" (speaking two languages).
The prefix "quad-" means "four." It is used in words like "quadrilateral" (a four-sided figure) and "quadruple" (four times as much).
The prefix "tri-" means "three." It is used in words like "tricycle" (a vehicle with three wheels) and "triangle" (a three-sided figure).
The prefix "hemi-" means "half." It is used in words like "hemisphere" (half of a sphere) and "hemiplegia" (paralysis of one side of the body).
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