Obtain the most frequent character.
If there is a tie between letters, return the first result alphabetically.
Additional test cases have been added.
Verify you 7th Test Suite.
Find the sum of the elements in the "second" diagonal
2 b | ~ 2 b
Vectorizing, too easy or too hard?
Number of digits in an integer
Alternately upper-lower case
Find the index of n in magic(n)
Sum of odd numbers in a matrix
index of n^2 in magic(n)
union without repitition
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