<Tri-2026-2807>, hint


 

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<Tri-2026-2807>,isosceles, midpoint

<Swiss MO 2017>


 

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<Tri-2026-2806>, hint


 

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<Tri-2026-2806>, general, concurrence

<Swiss MO 2018>



 

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<Cir-2026-813>, hint



 


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