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my %test;
$test{a}[2]{b} = 'Hello';
...
#   ( a => [ undef,
#            undef,
#            { b => "Hello" } ] )

if (!$hoh{$c1}{count}) { $hoh{$c1}{count} = 5; }   # verbose form

$hoh{$c1}{count} ||= 5;   # shortcut