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This page contains question about search, combination, permutation

1. 17-Letter Combinations of a Phone Number
2. 39-Combination Sum (video has a summary of permutation and combination)* unknown time Complexity
3. 40-Combination SumII
4. 77-Combinations
5. 78-subsets
6. 90-subsets2
7. 216-Combination SumIII
8. 46-Permutation
9. 47-PermutationII
10. 784-Letter Permutation* unknown time complexity
11. 22-Generate Parentheses* unknown time complexity
12. 20-Valid Parentheses
13. 51-Nqueens * unknown time complexity
14. 37-Sudoku Solver * unknown time complexity
15. 79-Word Search
16. 127-Word Ladder
17. 126-Word LadderII
18. 200-Number of islands