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2015-12-11T22:10:23+05:30

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Burglar alarm (2 NAND gates are used)
Freezer warning buzzer (2 NAND gates are used)
A push-button lock (2 AND & 1 NOT gate is used)
A light-activated burglar alarm (2 NAND gates are used)
A safety thermostat (1 AND gate is used)
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