Since scanning every possible off-topic post for some combination of letters that make up the topic word is too much work, I've decided to add Rule 25:
25) "Hidden" words count as on-topic only if clearly marked. Examples (with the topic of "Nerf"):
25a) "Can I be co-winner for the thread" is off-topic
25b) "Can I be co-winner for the thread" is on-topic
25c) "Can I be co-winner for the thread" is on-topic