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use 5.010;
use strict;
...

@xxx = (9,9,9);
say "@yyy";   # says "9 9 9"

use 5.010;
use strict;
...

@xxx = (9,9,9);
say "@yyy";    # says nothing

*answers_comments = one_param("answers","comments");

package ...;
sub answers_comments {
  ...;
}