23.5.3 By threes, in threes, three of


in ... by ...  
  Sono venuti in tre. They came by threes.
  Sono venuti in centinai They bought it by hundreds.

in ... in ...  
  Sono impacchetati in gruppi da dieci pezzi They were packed in tens.
  Li collezionò sempre tre a tre. He collected everything in threes.

  of ...  
  Eravamo tre. There were three of us.
  Eravamo dieci. There were ten of them.





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