you walk past the key and open the door of the rectangle, stepping outside.
there's nothing here.

walk around

go back inside for the key


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 |                                                                |‾ =   O   ?
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 |                                       O┴┘                      |  =  / \
 ‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾