Count the number of primes less than 'n'.
Nice test cases!
With a more robust Test Suite many/most of the submissions would fail for ignoring the Problem Statement instruction that primes must be less than n. Please add test cases in which the input x (or "n") is itself a prime.
Remove all the consonants
Check if sorted
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Determine the roots of a cubic equation
Energy of an object
Roots of a quadratic equation.
Linear system of equations
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