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C:\test>perl -Mstrict -wle" my $r = undef; my @x = map{ $_ } @{ $r }"

 DB<25> use strict; my @a = 0..5; my @b = map { $_ = $_*$_ } @a; print
+ "@a\n@b"
0 1 4 9 16 25
0 1 4 9 16 25