my $mol =  defined $n ? ( $n == 42 ? 'fourty two' : '' ) : 'n/a';

##</code><code>##

my $mol =
    defined $n ?
    (
    $n == 42 ? 'fourty two'
    : ''
    )
    : 'n/a'
;

##</code><code>##

my $mol = <noise> 'fourty two' <noise> 'n/a';

##</code><code>##

my $mol =

    ! defined $n
        ? 'n/a' :

    42 == $n
        ? 'forty two'

        : '';

##</code><code>##

my $mol =  defined $n ? ( $n == 42 ? 'fourty two' : '' ) : 'n/a';
#          ^^^^^^^^^^                                      ^^^^^

##</code><code>##

my $mol = ! defined $n ? 'n/a/' : $n == 42 ? 'fourty two' : '';