本文是Haskell官方教程：《A Gentle Introduction to Haskell, version 98》的简体中文翻译版。
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Premission is granted to correct, improve, or enhance this document. If you wish to publish updated versions of the tutorial on haskell.org please contact John Peterson.
Copyright (C) 1999 Paul Hudak, John Peterson and Joseph Fasel
Permission is hereby granted, free of charge, to any person obtaining a copy of "A Gentle Introduction to Haskell" (the Text), to deal in the Text without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Text, and to permit persons to whom the Text is furnished to do so, subject to the following condition: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Text.
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