While using auto-assembling a lot, one sometimes gets invalid combinations of words, like two consecutive prepositions.
A nice way to find these errors is by using QA > Check target segments for words.
Create a text file like qa_invalid_word_combinations.txt and add invalid word combinations to it, like:
Thanks for drawing my attention to this Hans. I wasn't aware of this option.
I don't have quite the same use case as you, but it's a great idea for spotting common typos which don't involve misspellings, like 'fro' for 'for', etc.