s='He was so tired'
ans = true
Renaming a field in a structure array
Distance walked 2D
Create a square matrix of multiples
Reverse a matrix
Area of a triangle
Find the Sum of the Series:
Find the product of the positive elements above the main diagonal.
Find the sum of the negative elements under the main diagonal.
Calculate the centroid of a triangle
Return ! if array element starts with a certain letter. Otherwise return ?
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