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Oh oh!  Someone left the door open.  Beau ran through the door and down the sidewalk.  He jumped into the back of the truck and snuggled down. 

Soon, the visitor came out of the house, got into the truck, and drove away up the mountains, with Beau unnoticed in the back.

The truck eventually came to a stop, and Beau jumped out, finally on his way to ... ADVENTURE!

The door has been left open!