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encrypting a document with 2 different keys

Is there a way to encrypt a file with 2 (or more) keys and then access it with only 1?
scenario :
Bob and Alice have a tight memory and can only remember ONE key.
Bob and Alice encrypt a file with their keys.
Bob goes in coma and Alice wants to access the file, but has only one key.

is there an algorithm that solves this?

encrypting a document with 2 different keys

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