Strunk (p. 75) nicely summarized the effect of errors in spelling.

‘He reads the form
though automatically, without thought of its needless complexity; he reads the
tho and mentally supplies the missing letters, at the cost of a fraction of his own attention.  The
reader has defeated his own purpose,’

Whenever a reader (or reviewer) encounters a spelling error, he notes it, and even if only correcting the
mistake in his mind, the time spent is time lost, as far as the author is concerned, for the reader is thinking
about the writing itself, not the ideas it contains.

Tip:  Use your word processor to catch spelling errors.  Add words to your dictionary with care and caution.
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