The Beast of Torrack Moor
An interactive fiction by Linda Wright (2007) - the Inform 7 source text
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Understand the command "lock" as something new. Understand "lock [something] with [something]" as locking it with. Understand "lock [an unlocked lockable thing] with [something]" as locking it with. Understand "lock [a lockable thing] with [something]" as locking it with.
Check locking it with:
abide by the must have accessible the second noun rule.
Procedural rule: substitute the right second rule for the can't lock without the correct key rule.