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In English spelling, the three letter rule states that only function words may have fewer than three letters. This rule is enforced by adding redundant letters to the spelling of content words containing fewer than three phonemes, such as ebb, add, egg, inn, bee, see, doe, awe, owe, eye, etc. This serves to highlight the special nature of function words (to which the rule does not apply) such as I, be, do, if, of, etc.
The main exceptions to the rule are go (which has a functional usage in the idiom going to do something), ox, and ax (usually axe in Commonwealth English). Other exceptional two-letter English words tend to be loanwords, such as the notes of the solfege scale (do, re, me, etc.; from Latin via Italian), or the Greek alphabet (pi, nu, etc.).
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