The best replacement for f2b is h2b.

The best alternatives to f2b are rated as following:
★★★★★  h2b
★★★  f1b goldendoodle

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Speaking about f2b, one probably shouldn't forget about f20b.

Other search terms related to f2b and their ratings are:
★★★★★ f20b
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Google Trends

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f2b
h2b
f1b goldendoodle