🔸 Ternary Letters (Triplet Grid)
These 8 letters (Q through X) represent every combination within a single quarter-note beat divided into three triplet eighth notes (1 ka ta).
Stroke glyphs for the trainer: `|` full · `↓` down · `↑` up · `-` tap

Note: kit patterns use unit `X-x-x-` (6 slots). **Grid 12** bar = unit × 2 (12 slots).

| Letter | Greb's notation | pattern (Grid 12) | one hand stroke types | two hands stroke types |
| :--- | :--- | :--- | :--- | :--- | 
| Q | X . . | X-g-g-X-g-g- | down-tap-up | down-tap-tap |
| R | . X . | g-X-g-g-X-g- | up-down-tap | tap-down-tap |
| S | . . X | g-g-X-g-g-X- | tap-up-down | up-tap-down |
| T | X X . | X-X-g-X-X-g- | full-down-up | down-down-up |
| U | . X X | g-X-X-g-X-X- | up-full-down | up-down-down |
| V | X . X | X-g-X-X-g-X- | down-up-down | down-up-down |
| W | X X X | X-X-X-X-X-X- | full-full-full | full-full-full |
| X | . . . | g-g-g-g-g-g- | tap-tap-tap | tap-tap-tap |