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my $string= 'AAABBBCCCDD';
my @words= grep $i=!$i,split /(?<=(.))(?!\1)/,$string;
print join "\n",@words,'';
There is no Extraterrestrial life
There aren't any suitably capable Extraterrestrials
Interstellar travel is too difficult
We're too uncool / not worth the trouble
What do you mean they haven't visited?
Results (533 votes). Check out past polls.