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### 4-Bit Combination Lock Puzzle
This digital logic circuit functions as a 4-bit combination lock puzzle. Your goal is to toggle the four switches on the left to discover the correct 4-bit secret code that turns on #LED1.
### How It Works
* Each toggle switch generates a digital logic high ($5\text{ V}$) or low ($0\text{ V}$).
* Two inverters invert specific bits to enforce matching specific $0$ patterns.
* Two 2-input AND gates evaluate intermediate pairs of signals (#m1 and #m2).
* A final 2-input AND gate outputs high to #match only when all four bits satisfy the exact combination.
* Current-limiting resistor #R1 protects #LED1 when the correct combination is solved.
### Solving the Puzzle
Out of $2^4 = 16$ possible binary combinations, exactly **one** secret code activates #LED1. Toggle the switches to crack the combination!
