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Use of uninitialized value in concatenation (.) or string at first.pl +line 5.
foreach my $num (@arr) { print "Index is: $num. Value is: $arr[$num] "; }
foreach my $num (@arr) { print "Index is: $num. Value is: $arr[$num - 1] "; # Subtra +ct 1 from the index }
for($num = 0; $num<= $#arr;$num++) {
for (my $num = 0; ...
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