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paperairplanes

The plural of half is 'halves.' 

taskmasters

plural of half is halves.

Most singular nouns ending in f, fe, ff are in plural form when s is added at the end.
Other singular nouns ending in f, fe, ff become plural by changing the f into ves. just like half, the f is removed and ves is placed, making it halves.
Other nouns have two plural forms, either s is added or ves is used as replacement.

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