An user Spanish
says…

Es
Auxiliary
  sólo
Adverb
  la
Determiner
  función
Noun
  indicador
Adjective
  de
Adposition
  los
Determiner
  diferentes
Adjective
  tramos
Noun
  de
Adposition
  nodo
Noun
.

It is only the indicator function of the different node sections.

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