* Added Implementation for XNOR gate
* Added Implementation for OR gate
* Added implementation of NAND gate
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* Added Implementation of NAND gate
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* Updated nand_gate.py
* updated xnor_gate.py after some changes
* Delete due to duplicate file
* Updated xnor_gate.py
* Added Implementation of NOT gate in python
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* fixed a typo error
* Updated to a new logic
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* Updated nand_gate.py file
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