Step by step, heart to heart, left right left.
一步又一步，心连着心，左右左。
Proceeding right to left, take each of the digits skipped in step 1 and add them to the result digits from step 1.
右到左，把每个数字跳过步骤1中并将它们添加到结果从步骤1位数。
Proceeding right to left, take each of the digits skipped in step 1 and add them to the result digits from step 1.
右到左，把每个数字跳过步骤1中并将它们添加到结果从步骤1位数。
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