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'Intersection Sudoku 2' printed from https://nrich.maths.org/
We received an email from Anna Olszanska, a maths teacher at a
school in Warsaw, Poland, telling us that this puzzle was solved by
some of her 13-15 year old students during the School Sudoku
Challenge. The best time was 19 minutes and was achived by
Maja.
Well done Maja.