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clarification needed

what do you mean with the sentence "Numbers are always right side up regardless of the orientation of the domino"? (5.17)

Imagine you had a physical domino with the numerals "0" and "5" printed on it. If you turned that domino upside-down, the printed "5" would also be upside-down. But since this is a paper puzzle, you enter the 5 right-side up no matter how the domino is oriented relative to the reference domino (you probably do this anyway, the instructions just spell it out for you.)