At 5 characters 

my @keys = keys %{{f}};

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is much more elegant than the equivalent 
use List::Util qw( shuffle uniq pairkeys );
my @keys = shuffle uniq pairkeys f;

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Remember that hashes do uniq'ing and shuffling for free :)

UPDATE: added a missed "keys" as LanX pointed out.

In reply to Re: Using 'keys' on a list by tybalt89
in thread Using 'keys' on a list by lammey

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