How does Gyro Gearloose's security system work?

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In the DOS version of DuckTales: The Quest for Gold, there is a security system, where you must prove, that you are not a Beagle Boy.
Unfortunately, I can't solve this. I'm not good in English, so maybe, I'm missing something...
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gyro gearloose being the maddest scientist AND CITIZEN of duckburg for 10 minutes NOT straight.
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Images: Brett Sayles, Nikita Belokhonov, Erik Mclean, Erik Mclean