Prime factor digits
Get the area codes from a list of phone numbers
select the primes of a vector
Find the index of the largest value in any vector X=[4,3,4,5,9,12,0,4.....5]
Energy of a photon
Multiply a column by a row
Simple spirometer - find your lung capacity from the number and size of soap bubbles in one breath
letter yes yes & letter no no
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