| Answer | Crossword Clue |
|---|---|
| APO | Letters for soldiers' letters |
| APO | Letters on letters to soldiers |
| APO | Letters for soldiers |
| APO | Letters for enlistees' letters |
| cryptarithm | an arithmetic problem in which letters have been substituted for numbers and which is solved by finding all possible pairings of digits with letters that produce a numerically correct answer |
| cryptarithms | CRYPTARITHM, an arithmetic problem in which letters have been substituted for numbers and which is solved by finding all possible pairings of digits with letters that produce a numerically correct answer |
