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use strict;
my @result;
...
  push @result, $val;
  $val = add($val,$one);
} until $one.$one eq $val;

sub f {  die if $::f_A;
         die if $::f_B;
...
  push @result, $@ =~ /line ([^.]+)\./;
  $$_ = undef;
}

my @result = split " ", "pasarauatawavayaxapq"^"AAAAAAAAAAAAAAAAAAAA";