7. Create a Document Term matrix from the corpus.
8. Determine the words those co-occurred frequently with each of our predetermined keywords
9. Manually inspect all the frequently co-occurring words, to determine which keywords should be added to the predeter- mined keywords list. The last row of Table 5 lists the key- words, we added after the test-mining.
6. We created a Document-Term matrix [48] from the corpus.
7. We determined whether any additional words co-occurred frequently with each of our initial keywords (co-occurrence probability of 0.05 in the same document)
8. We manually analyzed this list of frequently co-occurring additional words to determine whether to include any in the final keywords list. The last row of Table 2 lists the keywords added through this method.