This file is indexed.

/usr/share/games/atomix/level/sequence is in atomix-data 3.19.4-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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<levelsequence>
<level name="Water"/>
<level name="Methane"/>
<level name="Methanol"/>
<level name="Ethylene"/>
<level name="Propylene"/>
<level name="Ethanal"/>
<level name="Ethanol"/>
<level name="Acetic Acid"/>
<level name="Dimethyl Ether"/>
<level name="Methanal"/>
<level name="Acetone"/>
<level name="Trans Butylen"/>
<level name="Butanol"/>
<level name="Propanal"/>
<level name="Pyran"/>
<level name="Cyclobutane"/>
<level name="Ethane"/>
<level name="Lactic Acid"/>
<level name="Glycerin"/>
</levelsequence>