Another fun one is the multiple index problem: http://pepijndevos.nl/2012/08/12/the-multiple-index-problem.html http://pepijndevos.nl/2012/08/12/the-multiple-i

Another fun one is the multiple index problem: http://pepijndevos.nl/2012/08/12/the-multiple-index-problem.html http://pepijndevos.nl/2012/08/12/the-multiple-index-problem....