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contents(algo): split recommended qns into essential vs practice
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@ -64,10 +64,17 @@ def merge_overlapping_intervals(a, b):
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return [min(a[0], b[0]), max(a[1], b[1])]
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```
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## Recommended questions
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## Essential questions
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_These are essential questions to practice if you're studying for this topic._
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- [Merge Intervals](https://leetcode.com/problems/merge-intervals/)
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- [Insert Interval](https://leetcode.com/problems/insert-interval/)
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## Recommended practice questions
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_These are recommended questions to practice after you have studied for the topic and have practiced the essential questions._
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- [Non-overlapping Intervals](https://leetcode.com/problems/non-overlapping-intervals/)
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- [Meeting Rooms (LeetCode Premium)](https://leetcode.com/problems/meeting-rooms/)
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- [Meeting Rooms II (LeetCode Premium)](https://leetcode.com/problems/meeting-rooms-ii/)
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