exists($hash{keyA}{keyB}{keyE}{keyF})

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is short for 
exists($hash{keyA}->{keyB}->{keyE}->{keyF})

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exists doesn't autovivify, but -> sure does. Add 

no autovivification;

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In reply to Re: exists() for a hash child-key creates the parent key? Bug? by ikegami
in thread exists() for a hash child-key creates the parent key? Bug? by AnonymousPerl1

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