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The following four unconventional machining processes are available in a shop floor. The most appropriate one to drill a hole of square cross section of $6$ $mm \times 6$ $mm$ and $25$ $mm$ deep is

  1. Abrasive Jet Machining
  2. Plasma Arc Machining
  3. Laser Beam Machining
  4. Electro Discharge Machining
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