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

my $mol =
    defined $n ?
...
    )
    : 'n/a'
;

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

my $mol =

...
        ? 'forty two'

        : '';

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

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