A few years ago, my local school district invested in software designed to teach students better writing skills.
During my daughter's initial assignment using the software, her first draft earned a 5.9 out of 6. The tenth of a point deduction was for repeating a short phrase. Fair enough. She changed the wording — maybe four words — and her score inexplicably plummeted to a 4. She put the original wording back and her score rose by a couple tenths of a point. Then she spent the next three hours trying to figure out how to get her score back up and left the computer sobbing and declaring that she hated writing and school.