EXPIO is incorrectly written, and should be written as "I be" being its meaning:1st person singular of the present indicative form of the verb to atone for ( if outside atoned for it, would be the 3rd person singular of the past perfect simple or indefinite the same verb ). Atone means repair with some punishment or penance the lack or the offence committed. Often the Atonement fails to repair and becomes in a sense of guilt that remains. Atone also may mean purifying something considered sacred, as a temple, after a desecration.
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