[Haskell-beginners] module "static" data

[Dennis Raddle]

I would like to know how to do something in Haskell. I have a module which
needs to load some data from disk in order to run, and I'd like to load it
at most once. In C, I would use a "static" variable in the module to store
the data. How can I do this in Haskell?
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