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EXP. 012
EXP. 012
Punch Card
Six hole positions to a column, and every hole is a number. Punch them, and the reader says a letter back.
HOLLERITH CARD12 COL × 6 ROW
PUNCH / A HOLE IS A BIT
12 columns · not one hole yet
How to play
Click cells to punch. The six holes in a column add up to a number: 1–26 are letters, 27 is a space, 28–37 are digits. Press read and see what comes out.