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Carl Löndahl
  • Member for 7 years, 2 months
  • Last seen this week
10 votes
2 answers
906 views

Bouncing ball on a billiard board

11 votes
2 answers
416 views

A curious circuit

9 votes
3 answers
399 views

A problem of inequalities

12 votes
1 answer
391 views

Fitting the pieces