For a given square matrix x and scalar a, find x^a without using '^' or 'mpower'.
Find the peak 3n+1 sequence value
Find state names that start with the letter N
Similar Triangles - find the height of the tree
middleAsColumn: Return all but first and last element as a column vector
Decoding : Find the value
Get ranks of values in a vector
Count up then down
Replace multiples of 5 with NaN
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