[Haskell-cafe] Custome monoid mappend on HashMap and HashSet values

Hello, Does anyone have an example on how I might be able to use monoids to mappend a HashMap Int (HashMap Int Int) together? Cheers, -John -- <http://www.gocatch.com/> Sydney, Australia <https://www.facebook.com/goCatch> <https://twitter.com/gocatchapp> <http://www.linkedin.com/company/goCatch> <https://itunes.apple.com/au/app/gocatch/id444439909?mt=8> <https://play.google.com/store/apps/details?id=com.gocatchapp.goCatch&hl=en> <http://www.windowsphone.com/en-au/store/app/gocatch/d76b0eb5-bad6-429f-b99e-0ce85d953f93> <http://appworld.blackberry.com/webstore/content/31917887/>