I7 One Door Two Keys?

[Darien]

Is it possible in Inform 7 to make one door with two keys? I have been
trying just now and it keeps complaining. I had wanted to make a
little simple sort of puzzle at the start of a game- you walk into a
house and the door locks behind you. You can either spend a few
minutes looking around for the key, or search your inventory and find
out that you actually already have one. But this doesn't seem to be
panning out- Inform just doesn't like me saying "such and such door
has two matching keys" or "Key A unlocks door 1. Key B unlocks door
1."

Thanks in advance.

[256]

There's probably a more elegant way to do this, but this works:
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Kitchen is a room. Parlor is a room. The player is in Kitchen.
Portal is east of kitchen and west of parlor. Portal is a locked door.

Before unlocking portal with keyb:
say "You unlock Portal.";
Now portal is unlocked;
rule succeeds.

Before locking portal with keyb:
say "You lock Portal.";
now portal is locked;
rule succeeds.

KeyA is in Kitchen. KeyA unlocks portal.
KeyB is in Kitchen.
KeyC is in Kitchen.

test me with "open portal/take keyc/unlock portal/take keyb/unlock
portal with keyb/lock portal with keyb/take keya/unlock portal with
keya."

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-duff