[null and void]

I’d draw a diagonal line across the tops of the decks with a felt-tip pen (Sharpies hadn’t been invented yet) against just such an eventuality...

[OldMissileer]

I’d draw a diagonal line across the tops of the decks with a felt-tip pen (Sharpies hadn’t been invented yet) against just such an eventuality...

You could make rows as comments that would not be read by the computer. My first rows always were comment rows and I would type the card's number. The only problem was that sub-routine I tipped onto the floor had a few hundred cards.