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+package com.mlefevre.maths.parser;%0A%0Aimport com.sgcib.fip.common.maths.domain.Formula;%0A%0Apublic interface FormulaParser %7B%0A%0A    /**%0A     * Convert the given chain into a formula%0A     *%0A     * @param chain%0A     * @return the parsed formula%0A     */%0A    Formula parse(String chain);%0A%0A%7D%0A

Create FormulaParser.java