Which one of the following is an acceptable schedule for the training?

I was able to solve this game in under 5 minutes by guruing all 6 possibilities as such with - representing an open space: 1. QTSU--R 2. QTS-U-R 3. QTSUR-R 4. URSQT-- 5. -QTSU-R 6. QT-SU-R I saw the instructor made 4 possibilities, but if you just draw a line with s3 and s4 then you can map out all 6 logically in under 60 seconds as these rules are very simple. Not meaning to take anything away from the instructor of course, she is a genius and her walk-throughs are extensively helpful.