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Two
Numeral
  oxygen
Substantivo
  and
Conxunción coordinante
  two
Numeral
  nitrogen
Substantivo
  high-pressure   gas tanks   are
Auxiliar
  attached
Verbo
  externally
Adverbio
  to the   airlock
Substantivo
.

Two oxygen and two nitrogen high-pressure gas tanks are attached externally to the airlock.

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