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Adjective
  years
Noun
  of
Adposition
  research
Noun
  were
Auxiliary
  spent
Verb
  understanding
Verb
  the
Determiner
  reactions
Noun
  involved
Verb
.

More years of research were spent understanding the reactions involved.
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The Volta-Congo language of the Mossi people, mainly spoken in part of Burkina Faso.

New
of

New
research

New
were

New
spent

New
the

New
reactions

plural of reaction

New
involved

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