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  • If homework, please tag as such. Commented Apr 14, 2012 at 23:57
  • Do you have a database? Commented Apr 15, 2012 at 0:22
  • 1
    @ThorbjørnRavnAndersen We've blacklisted [homework], here's why... Commented Apr 15, 2012 at 7:15
  • @Thorbjørn Ravn Andersen: It is not homework, it is a project I am working on. This pattern is occurring again and again and I am trying to find a more general solution / approach. Commented Apr 15, 2012 at 8:07
  • @Emmad Kareem: I do not have a database and even if I had I would like to see the data as streams and process the data by composing functions on streams. I find it is a very elegant and efficient approach, but I am still learning how it works. Commented Apr 15, 2012 at 8:08