This is a variation on an old puzzle by Martin Gardner. This desk calendar currently displays the date Monday, April 25. If the six cubes are capable of displaying any day of the week and any date from January 01 to December 31, what characters appear on the unseen faces in the picture? Gardner wrote, “It is a bit trickier than one might expect.”

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The task can be done if four of the characters serve double duty: 6 inverted can serve as 9, n as u, p as d, and W as M. Here’s one possible solution: