One of the mysteries of the English language finally explained.
1‘an elementary astronomy course’
basic, rudimentary, fundamental, basal
primary, preparatory, introductory, initiatory, early
essential, radical, underlying
2‘playing the blues really is elementary’
easy, simple, straightforward, uncomplicated, undemanding, unexacting, effortless, painless, uninvolved, child's play, plain sailing
rudimentary, facile, simplistic
informal as easy as falling off a log, as easy as pie, as easy as ABC, a piece of cake, easy-peasy, no sweat, kids' stuff
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