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Addition errors occur when extra characters are accidentally inserted during data entry. This can happen from double-tapping keys, misreading source data, or accidentally hitting adjacent keys. The result is a longer string than the original. Like omission errors, these can be quickly detected by checking length.

Original: ABCD → Error: ABCXD (X inserted)

• 12345 → 123345 (extra 3 inserted)
• SMITH → SMIITH (extra I inserted)
• AB-1234 → AB-12334 (extra 3 inserted)

Πώς να το αναγνωρίζετε

• Copy is longer than original
• Contains all original characters plus extras
• Often a repeated or adjacent character

Συνηθισμένα λάθη

• Not noticing the length difference
• Missing subtle additions in long strings
• Confusing with doubled legitimate characters

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