Compare the two addresses: '1847 Maple Drive, Portland, OR 97201' and '1847 Maple Drive, Porland, OR 97201'. What type of error is present?
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A
Omission error — a letter is missing from 'Portland'
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B
Insertion error — an extra letter was added
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C
No error exists between the two addresses
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D
Transposition error — two letters are swapped