say%{"Mg O2"=>"2Mg+O2->2MgO","H2 O2"=>"2H2+O2->2H2O","C2H2 O2"=>"2C2H2+5O2->4CO2+2H2O"}[hear()]
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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