the [e]s … the [a]s

[Odessa Dawn]

separate - How do you separate the [e]s from the [a]s in this word? Simple: the [e]s surround the [a]s.
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100 Most Often Mispelled Misspelled Words in English

I don’t know what the purpose of s here is? Will you tell me, please?

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[probus]

The purpose of s is to make both e and a plural. The usage employed by the author is non-standard.

In the author's example separate there is an e followed by an a and then another a, followed by an e . The author claims that "the [e]s surround the [a]s" but how general and useful this rule is I don't know.

 

[Rover_KE]

It shows the simple plural of the letters e and a.

The word 'addresses' has two 'e's and three 's'​s.

 

[5jj]

Rover's way of writing the plural form of the letters is more natural than the original.