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

  primary cache
  L1 cache
  level 1 cache
  level one cache
      (L1 cache, level one cache) A small,
     fast cache memory inside or close to the CPU chip.
     Intel+80486+has+an+eight-{kilobyte">For example, an Intel 80486 has an eight-{kilobyte on-chip
     cache, and most Pentiums have a 16-KB on-chip level one
     cache that consists of an 8-KB instruction cache and an 8-KB
     data cache.
     The larger, slower secondary cache is normally connected to
     the CPU via its external bus.

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