δολάριο, κόστος, χρηματοδότηση, αριθμομηχανή, Ζήτημα κόστους, επίπτωση, Εθνική οικονομία, φροντίδα υγείας, στηθοσκόπιο, σφυγμός, συχνότητα
Public Domain
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