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  1. or download this
      DB<182> $s=join '{e,a}',split /e/,"ferber"
 => "f{e,a}rb{e,a}r"

  DB<183> @a=< $s >
 => ("ferber", "ferbar", "farber", "farbar")
  2. or download this
      DB<192> @a=glob(join '{e,a}',split /e/,"ferber")
 => ("ferber", "ferbar", "farber", "farbar")