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 for fully associative cache
From The Free On-line Dictionary of Computing (30 December 2018) :

  fully associative cache
      A type of cache in which data from any
     address can be stored in any cache location.  The whole address
     must be used as the tag (the value that identifies a block of data
     in the cache).  All tags must be compared simultaneously
     (associatively) with the requested address and if one matches then
     its associated data is accessed.  This requires an associative
     memory to hold the tags which makes this form of cache more
     expensive.  It does however solve the problem of contention for
     cache locations ({cache conflict) since a block need only be
     flushed when the whole cache is full and then the block to flush
     can be selected in a more efficient way.
     The alternatives are direct mapped cache or set associative

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