list of open conjectures which are solved by students in high-Middle school level or receprocally?

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I know only Snevily's conjecture which it was proved in 2009 by Bodan Arsovski. and He was a high-school student at the time., Are there other conjectures which are solved by students in high school or middle school level ? or Are there proposal conjectures by student in high-middle school level to be open ?