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my %hash = ( k0 => 'c0',
             k1 => 'v1',
...
           );
my $search = 'k2';
my $val = $hash{$search};

my %hash = ( k0 => ['c0'],
             k1 => ['v1'],
...
           );
my $search = 'k2';
my @vals = @{ $hash{$search} };