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  1. or download this
    my $f;
$f = $h->{b}{c}{d} if exists($h->{b}{c}) and exists($h->{b}{c}{d});
  2. or download this
    use feature 'state';  # 'use 5.10' or later also gives this automatica
+lly
state $f = $h->{b}{c}{d} if exists($h->{b}{c}) and exists($h->{b}{c}{d
+});