[Jelly](https://github.com/DennisMitchell/jellylanguage) has an atom called untruth, which when given indices, creates an array with 1s at those places: `[2,4] → [0,1,0,1]`.
You are required to perform the inverse of this. Given a 2D boolean array, find the indices of the true values in it.
# Challenge
You will be given a single 2D boolean array \$M\$. You may take its dimensions as a separate argument if needed.
The output must consist of all the indices of the true values in \$M\$.
Output may be 0-indexed or 1-indexed.
It is guaranteed that the input will only consist of two different values.
# Test Cases
All test cases are 0-indexed.
```
I: [[1,0,1,1,1,0]]
O: [[0,0],[0,2],[0,3],[0,4]]
I: [[1,0,1],[1,0,1],[0,1,0]]
O: [[0,0],[0,2],[1,0],[1,2],[2,1]]
```
