These elements are indestructible. (no known explosive is able to destroy it)

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Element number 28 (DMND) properties:
  It's a pretty good heat conductor.

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Element number 190 (INDI) properties:
  It's indestructible version of INSL.
  When .tmp = 1, it's not movable.

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Element number 193 (INDC) properties:
  It's indestructible version of METL.