Good problem and I love the level idea.
How to find the position of an element in a vector without using the find function
Reverse the Words (not letters) of a String
middleAsColumn: Return all but first and last element as a column vector
04 - Scalar Equations 2
Can we make a triangle?
Identify the sequence
Sorting integers by their digits (Level 3)
Increasing sub-sequence (Level 2)
Return the sequence element I
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