Hi! Thanks for taking the time to look at my solution.
Tested with ==> PHP 5.6.11
git clone https://github.com/BrendaManrique/cod-dictionaryUniques.gitDocumentation and project description can be found under the ./data directory.
1 input file is available.
words.txt (the input file provided with the requirements)
2 output files
The information in the document was treated as lower case characters. The output of the solution: The document "uniques.txt" and "fullwords.txt" with every sequence of four letters that appears in exactly one word of the dictionary and it's corresponding word in the second file. I tried to go further and added an option to get all the words linked to every sequence of 4 characters.
Again, thanks Craig for taking a look at my solution. Please feel free to drop me a line if you have any questions!