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sign-0.4.1: README.md

sign
====

[![Build Status](https://secure.travis-ci.org/msakai/sign.png?branch=master)](http://travis-ci.org/msakai/sign) [![Hackage](https://budueba.com/hackage/sign)](https://hackage.haskell.org/package/sign)

Arithmetic over signs (i.e. {-,0,+}) and sets of signs