aaaa
b c
b c
dddd
e f
e f
gggg
- Signal of length 2 maps to digit 1, but can't which signal maps to segment c and which to segment d
- Signal of length 3 maps to digit 7. The wire unique between 7 and 1 yields the wire driving segment a.
- Signal of length 4 maps to digit 4.
- Signal of length 5 maps to digits 2, 3, or 5.
- Signal of length 5 that contains the signal for digit 1, maps to digit 3. After removing the signal for digit 1, the common wire between signals 4 and 5 drives segment d.
- Segment b is driven by the wire contained in signal for 4 that does not drive segment d nor the wires for signal 1
- Signal of length 5 that contains the wires driving segment a, b, and d maps to digit 5. The intersection of the signals for digit 5 and digit 1 gives the wire driving segment f. The remaining wire in the signal for digit 5 drives segment g.
- Resolving the wire driving segment f means the wire driving segment c can be determined from the signal mapping to digit 1.
- The wire driving segment e is the one wire remaining.