Crossword Genius

For Aristotle and Euclid to appear from the start among elements of basic education is not so normal (5)

Ross

I believe the answer is:

rarer

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(Other definitions for rarer that I've seen before include "More unusual" , "More scarce or uncommon" , "Stranger" , "Less frequent" , "even less common" .)

I've seen this clue in The Guardian.
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