my %hash = (
   ( map { $_=>'toto' } qw( a b c f t u ) ),
   ( map { $_=>'titi' } qw( b g k p ) ),
);

##</code><code>##

$hash{$_} = 'toto' for qw( a b c f t u );
$hash{$_} = 'titi' for qw( b g k p );