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my @a = qw( a b c d );
my $i = sub { @a ? splice(@a, 0, 2) : () };
while (my ($x,$y) = $i->()) {
   print("$x:$y\n");
}

my @a = qw( a b c d );
my $i = sub { @a ? splice(@a, 0, 2) : (undef,undef) };
while (my ($x,$y) = $i->()) {
   print("$x:$y\n");
}