Mathematics · Reasoning
If 684 is coded as 132 (where 6-5=1, 8-5=3, 4-2=2) and 970 is coded as 546 (where 9-4=5, 7-3=4, 10-4=6, representing a digit-by-digit subtraction of 552), then applying the same logic of subtracting 552 from each number, what is the value of 478 + 609 in coded form?
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408
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