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 for hole model
From The Free On-line Dictionary of Computing (30 December 2018) :

  hole model
      A model of semiconductor behaviour in which
     donors contribute a positive charge equal in magnitude to the
     charge of an electron, and acceptors contribute space for such
     a charge within the crystal lattice.
     The hole model was proposed well before electrons were discovered
     and described.  Much of electronics, especially at the
     engineering level, continues to consider current as flowing from
     positive to negative.

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