Nice catch. I should eliminate the sorting on the input words anyways, but save the duplicates in the neighbors, i.e. cache the previous ones. It does not affe

Nice catch. I should eliminate the sorting on the input words anyways, but save the duplicates in the neighbors, i.e. cache the previous ones. It does not affect the Big O level I mentioned in sorting of the word list loaded from the file. Looks like it's the necessary step.