if(  ! $names{$hash}  ) {
    $names{$hash}= $name;
} elsif(  ! ref( $users{$hash} )  ) {
    $users{$hash}= [ $users{$hash}, $name ];
} else {
    push @{ $users{$hash} }, $name;
}

##</code><code>##

    $users{$hash} .= $name.$;;