Make a square matrix with this shape. For n=4
1 1 0 0
1 0 1 0
0 1 0 1
0 0 1 1
Find state names that end with the letter A
Return the first and last character of a string
Doubling elements in a vector
sum of non-primes
How many jokers?
Derivative of polynomial
Altitude of locations on the earth
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