elementary, simple, uncomplicated, unproblematic -- (easy and not involved or complicated; "an elementary problem in statistics"; "elementary, my dear Watson"; "a simple game"; "found an uncomplicated solution to the problem")
elementary -- (of or pertaining to or characteristic of elementary school or elementary education; "the elementary grades"; "elementary teachers")
elementary, elemental, primary -- (of or being the essential or basic part; "an elementary need for love and nurturing")
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