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Crystals
Noun
  are
Auxiliary
  of
Adposition
  frequent
Adjective
  occurrence
Noun
  and
Coordinating conjunction
  they
Pronoun
  usually
Adverb
  have
Verb
  very
Adverb
  bright
Adjective
  and
Coordinating conjunction
  smooth
Adjective
  faces
Noun
.

Crystals are of frequent occurrence and they usually have very bright and smooth faces.

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