Current Perl documentation can be found at perldoc.perl.org.
Here is our local, out-dated (pre-5.6) version:
No, Perl's garbage collection system takes care of this.
sub makeone { my @a = ( 1 .. 10 ); return \@a; }
for $i ( 1 .. 10 ) { push @many, makeone(); }
print $many[4][5], "\n";
print "@many\n";