For question 2: 1. check with empty string. 2. check with a string which is in the file 3. check with a string which is not in the file 4.check with a string which has a different case as that in the file. eg. if the file contains structure and does not contain Structure, check find and replace with input string as Structure 5. check with a string having a space followed by a string 6. check with a string having a string followed by a space 7. check with a string having only space or tabs
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