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In page Primary school:

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In some parts of the United States, "primary school" refers to a school covering kindergarten through to second grade or third grade (K through 2 or 3); the "elementary school" includes grade three through five or grades four to six.[citation needed] In Canada, "elementary school" almost everywhere refers to Grades 1 through 6; with Kindergarten being referred to as "preschool."[citation needed]