This has been asked before here, but I think this rule should be reviewed with regard to correcting of coding syntax.
This answer on SO was very helpful, except that the code syntax was fatally incorrect by just one character - an extra colon has been inserted between 'rake' and 'db'. However, removing the colon does not satisfy the 6 character rule. I don't think the application of the rule in this case is aligned with the principle of the rule; that is, I believe removing the colon is a substantial improvement on the original answer and should be allowed in isolation.
I've re-read the answer a few times and can't see any other way I could improve it, otherwise.