Row 5 · 3
The 7-bit ledger
A status column that reads only ka and kha, in rows of seven, is a column of ones and zeros. Each row is one letter.
Read ka as 1 and kha as 0. Seven of them make a 7-bit number, and computers have used 7-bit numbers for letters since the 1960s (ASCII): 1000001 is A, 1001011 is K.
| row 1 | ka |
| row 2 | kha |
| row 3 | kha |
| row 4 | ka |
| row 5 | kha |
| row 6 | ka |
| row 7 | ka |
The places, from the left, are worth 64, 32, 16, 8, 4, 2 and 1. Add up the places that say ka. Here: 64 + 8 + 2 + 1 = 75, which is K.
It is a classical cipher and a fair one: nothing is hidden except the rule, and now you have the rule.