four-layer
four-level
four-of-eight
four-out-of-eight
four-output
four-over-four
four-phase
four-point
four-pole
four-port
  four-region
four-speed
four-stacked
four-terminal
four-track
four-way
four-wire
Fowler-Nordheim
fox
foxtrot
fp

    four-region

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