1. Release hundreds
8 - 2 = 6; drop 6.
4 visual steps / visible-place subtraction
8 - 2 = 6; drop 6.
6 - 3 = 3; drop 3.
4 - 1 = 3; drop 3.
Read 6 | 3 | 3 as 633; borrow is gone.
A few quick rounds make each dropped digit feel light; borrow is the only thing to keep.
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