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contents(algo): split recommended qns into essential vs practice

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Yangshun Tay
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contents/algorithms/matrix.md
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@ -62,10 +62,17 @@ Transposing a matrix in Python is simply:
transposed_matrix = zip(*matrix)
```
## Recommended questions
## Essential questions
_These are essential questions to practice if you're studying for this topic._
- [Set Matrix Zeroes](https://leetcode.com/problems/set-matrix-zeroes/)
- [Spiral Matrix](https://leetcode.com/problems/spiral-matrix/)
## Recommended practice questions
_These are recommended questions to practice after you have studied for the topic and have practiced the essential questions._
- [Rotate Image](https://leetcode.com/problems/rotate-image/)
- [Valid Sudoku](https://leetcode.com/problems/valid-sudoku/)