The Level 1 kanji 口 references the mnemonic for the Level 1 kanji 工 although it’s completely possible that the user may still have 工 locked. Is there a way to remove this reference, or at least mention the possibility that the user is unfamiliar with 工?
Here’s the mnemonic in question:
You can’t get that mouth out of your mind. Remember seeing the construction worker こういち earlier in the 工 mnemonic? You can’t forget construction worker こういち’s mouth.
EDIT: Thank you, @JenK, for fixing this so fast!