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I recommend starting much smaller, with an SSCCE that we can work from. Hardcode an array of words and print it out. When you have that working, only print out words that contain a certain hardcoded...

Which part is giving you trouble? Do you know how to output text to a file? Do you know how to create a List of Strings? Do you know how to use the String API to select the Strings you want? Create...

I see where you print out the "All the observations you asked for:" part, but I don't see anything printed out after that. What did you expect your code to do?