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Calendar Cubes
My grandmother has a pair of calendar cubes; each cube has six digits on it, one on each face.
Every morning, she re-arranges them to show the day of the month as a two-digit number (01 to 31).
Even though some numbers appear on both cubes, you can easily tell them apart because one cube is ivory and the other is brown.
I noticed that it was possible to use the ivory cube in the tens place and the brown cube in the ones place for SEVEN days in a row (within one month)!
Can you figure out what digits are on each cube?
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