it's this, URBRAVE all caps hope this helped!
I recommend checking the official American Girl website or contacting their customer service to inquire about secret ending codes for the book "Braving the Lake." They may also provide hints or additional resources to help you unlock the secret ending.
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Lake Elsinore, California, is in area code 951.
Lake Monsters - book - was created in 1991.
Toluca Lake is served by area code 818 and overlay code 747.
Lake Worth, Florida, is in area code 561.
The airport code for Red Lake Airport is YRL.
The airport code for Colville Lake Airport is YCK.
The airport code for Dease Lake Airport is YDL.
The airport code for Knee Lake Airport is YKE.
The airport code for Kingfisher Lake Airport is KIF.
The airport code for CFB Cold Lake is YOD.