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Updated reaction and organic response templates, including hints

<problem>

<startouttext />
<p>
Write a balanced reaction for hydrogen gas and oxygen gas forming water, using the smallest integer coefficients.
</p>
<endouttext />

<reactionresponse answer="2H2 + O2 -> 2H2O" initial="">
    <textline readonly="yes" />
    <hintgroup showoncorrect="no">

        <reactionhint answer="H2 + O -> H2O" name="gas"/>
        <hintpart on="gas">
            <startouttext />Oxygen is a diatomic gas.<endouttext />
        </hintpart>

        <stringhint answer="/\((s|l|g)\)/" name="state" type="re" />
        <hintpart on="state">
            <startouttext />Do not include symbols for state of matter in your answer.<endouttext />
        </hintpart>

    </hintgroup>
</reactionresponse>

</problem>
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