s='He was so tired'
ans = true
given 3 sides, find area of this triangle
Getting the indices from a vector
Set the array elements whose value is 13 to 0
Add a row of zeros on top of a matrix
Create a vector
Calculate the centroid of a triangle
Calculate the eigenvalues of A.
Solve the following system of equations.
Find the product of the positive elements above the main diagonal.
Return ! if array element starts with a certain letter. Otherwise return ?
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