## On the Subject of Logic Gates

There are only 10 types of bomb experts: those who understand logic gates, and those who don’t.

The module contains a circuit of 7 logic gates, lettered A through G. Logic gates are explained on the second page. The circuit has 8 inputs and 1 output. Determine all gate types and find an input configuration that will set the final output to on.AND +1 |
→ | OR +2 |
→ | XOR +3 |

↑ | ↓ | |||

XNOR +6 |
← | NOR +5 |
← | NAND +4 |

- The first row of 8 LEDs tell you the input states. The second row of 4 LEDs tell you the output states of gates A through D. Use the arrow buttons to cycle through different input configurations, and determine the gate types of the first four gates.
- One gate type will occur twice on the circuit, all others once. In the following rules, if the found gate type already occurs, and you already found the duplicate, continue taking single steps until you find an available gate type.
- To find the gate type of gate E:
- Start at the gate type of gate A in the diagram above.
- Take the +
*n*number of the gate type of gate B. Take that many steps following the arrows.

- To find the gate type of gate F:
- Start at the gate type of gate E in the diagram above.
- Take the +
*n*number of the gate type of gate C. Take that many steps.

- To find the gate type of gate G:
- Start at the gate type of gate F in the diagram above.
- Take the +
*n*number of the gate type of gate D. Take that many steps.

- Once you've established all gate types, cycle to an input configuration that will set the final output to on. Press ‘CHECK’. If the output is off, you’ve earned a strike.