They understand

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They understandThey understandThey understandThey understandThey understandThey understandThey understandThey understandThey understandThey understandThey understandThey understandThey understandThey understandThey understandThey understandThey understandThey understandThey understandThey understandThey understandThey understandThey understandThey understandThey understandThey understandThey understandThey understandThey understandThey understandThey understandThey understandThey understandThey understandThey understandThey understand