The Problem it is not challenging if the solution is provided openly in the Test Suite. See Problems 44617, 44616 & 44521 for discussion of some relevant details.
The solution is openly provided. Please change the test suite.
Add two numbers
Find all elements less than 0 or greater than 10 and replace them with NaN
Omit columns averages from a matrix
Create a two dimensional zero matrix
2倍してみよう - ここからスタート！
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