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Steel
Noun
  tension
Noun
  cables
Noun
  attached
Verb
  to
Adposition
  springs
Noun
  hidden
Verb
  inside
Adposition
  the
Determiner
  arms
Noun
  complete
Verb
  the
Determiner
 constant-tension  structure
Noun
.

Steel tension cables attached to springs hidden inside the arms complete the constant-tension structure.

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