Several things there that can be improved on. ;)
The first is that $ref is a hash reference. More likely you simply want a hash:
my %ref;
Perl allows some syntactic sugar that removes all those -> so you can write:
$ref{car}{Toyota}[2]="Corolla";
However if you want to initialize a hash then you can:
my %ref = (
car => {
Honda => [qw(Civic Accord)],
Toyota => [qw(Camry Tundra Corolla)],
}
);
taking advantage of qw so that the car names don't require quoting.
Perl is environmentally friendly - it saves trees
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