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print("4. Count the occurence of substring in a string") print("5. Find the first occurence of substring in a string") print("6. Replace a substring with another string") print("7. Swap the cases") print("8. To partition a string ") print("9. To join list into string ") print("10. To split a string") print("11. To apply lstrip") print("12. To ... ................
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