This can be described as the merger of the and lexical sets.

Origin

In a 2010 blog post, Wells wrote:

He also wrote that he claimed no copyright in the standard lexical sets, and that everyone was "free to make whatever use of them they wish".

Extensions

Some varieties of English make distinctions in stressed vowels that are not captured by the 24 lexical sets. For example, some Irish and Scottish accents that have not undergone the fern-fir-fur merger split

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