The best replacement for f is c.

The best alternatives to f are rated as following:
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★★  t
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★★  follistim
★  ph
★  haskell
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  dexron 3
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Your alternative for f is not listed? Suggest!
Speaking about f, one probably shouldn't forget about iui.

Other search terms related to f and their ratings are:
★★★★★ iui
★ crazy frog
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Google Trends

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