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sub strip { s/\A\s+//, s/\s+\z// for my @r = @_; @r }

sub strip {
    s/\A\s+//, s/\s+\z// for my @r = @_;
    @r
}

for ( 1 .. 3 ) {
    run_fork { child {
...
        exit;
    } }
}