In English spelling, the three-letter rule, or short-word rule, is the observation that one- and two-letter words tend to be function words such as I, at, he, if, of, or, etc. As a consequence of the rule, "content words" tend to have at least three letters.
In English spelling, the three-letter rule, or short-word rule, is the observation that one- and two-letter words tend to be function words such as I, at, he, if, of, or, etc. As a consequence of the rule, "content words" tend to have at least three letters.
Source: Wikipedia "Three-letter rule" · CC BY-SA 4.0
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