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>perl -wMstrict -le
"my $test = 'abc1 abc1 abc1 abc1 abc1';
...
 print $test;
"
Modification of a read-only value attempted at -e line 1.

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>perl -wMstrict -le
"my $addend = 0;
...
 print $test;
"
abc1 abc2 abc3 abc4 abc5