## On the Subject of The Missing Letter

I wonder where it went… Maybe it needed to go P? Maybe it went to find a new golf T? Or maybe it just wants to find U.

- This module consists of a 5×5 grid of letters. Every letter of the English alphabet should be present except one.
- Find the letter that’s not present on the module and perform the calculation in Table A to get a number. Take this number’s absolute value modulo 5 and add 1 to it. This number will be called
`n`. - Find the
`n`th word in Table B under the missing letter on the module and spell it out using the buttons to disarm the module. - If an incorrect letter is pressed at any time, a strike will be issued and the module will clear any input it has received so far.

Missing letter |
Calculation | Missing letter |
Calculation |
---|---|---|---|

A | B | ||

C | D | ||

E | F | ||

G | H | ||

I | J | ||

K | L | ||

M | N | ||

O | P | ||

Q | R | ||

S | T | ||

U | V | ||

W | X | ||

Y | Z |

**B** = number of batteries; **BH** = number of battery holders; **P** = number of ports; **PP** = number of port plates; **I** = number of indicators; **LI** = number of lit indicators; **UI** = number of unlit indicators; **S#** = serial number character in the #th position (A=1, B=2, ... Z=26); **A#** = alphabetic position of the #th letter on the module in column reading order (A1-5, B1-5, etc.)