The Beast of Torrack Moor
An interactive fiction by Linda Wright (2007) - the Inform 7 source text
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Understand the command "unlock" as something new. Understand "unlock [something] with [something]" as unlocking it with. Understand "unlock [a locked lockable thing] with [something]" as unlocking it with. Understand "unlock [a lockable thing] with [something]" as unlocking it with.
Understand the commands "open" and "uncover" and "unwrap" as something new. Understand "open [something]" or "uncover [something]" or "unwrap [something]" as opening. Understand "open [something] with [something]" as unlocking it with. Understand "open [a locked lockable thing] with [something]" as unlocking it with. Understand "open [a lockable thing] with [something]" as unlocking it with.
Check unlocking it with:
abide by the must have accessible the second noun rule.
Procedural rule: substitute the right second rule for the can't unlock without the correct key rule.
This is the right second rule:
if the noun provides the property matching key
begin;
if the second noun is not the matching key of the noun, say "[The second noun] does not fit [the noun]." instead;
otherwise;
say "[The second noun] does not fit [the noun]." instead;
end if.