How obesity leads to diabetes (mediators)

SELECT ?from ?to WHERE {
  ?from ex:causes ?to .
  ex:Obesity ex:causes* ?from .
  ?to ex:causes* ex:Diabetes
}

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The query

PREFIX ex: <http://ex/> SELECT ?from ?to WHERE { ?from ex:causes ?to . ex:Obesity ex:causes* ?from . ?to ex:causes* ex:Diabetes }