A friend of mine sent in this great example of bad directions on homework.
When one of my kids didn’t understand their homework, my go-to response was usually, “Did you read the directions?” If I heard nothing, that meant “no” and they were reading them. If I heard, “Yes, but I still don’t get it,” that was my cue to get up and help.
This would be one of those times. The second set of directions make no sense and, it would even be likely that a parent, reading quickly, would instinctively insert the word “prefix” where “suffix” is now.
Additionally, it would have been preferable for the teacher to include the hyphens before “ment” and after “im” to indicate information missing.