Can not use letters more than once #1
Description
This is because as each position in the sequence is given power, the rest are grounded. This means when a letter is being used more than once, there are two paths for that given position in the sequence: 1. the corresponding LED and 2. The other position is sequence[via the MULTI]. Thus the power is pull-down via the second route rather than lighting the led via the first route.
This can solved by place a diode in front of each step in the sequence. This will require reshuffling the board.