An user French
says…

Ceux-ci
Pronoun
  sont
Auxiliary
  parfois
Adverb
  difficiles
Adjective
  à
Adposition
  définir
Verb
  car
Coordinating conjunction
  une
Determiner
  liste
Noun
  peut
Verb
  combiner
Verb
  plusieurs
Determiner
  principes
Noun
.

These are sometimes difficult to define because a list can combine several principles.

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