I didn't realize you could use that function with non-digits in your string. Suddenly, this problem is a whole lot easier. :-)
Remove all the consonants
Test for balanced parentheses
Television Screen Dimensions
Tick. Tock. Tick. Tock. Tick. Tock. Tick. Tock. Tick. Tock.
Highest powers in factorials
Sums of Distinct Powers
A (wrong) place for everything, and everything in its (wrong) place
How brilliant are you?
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