2 × 3 × 3 = 18
The theoretical grid is 2 adjective definiteness types × 3 dependent forms × 3 dependent cases = 18. The traditional treatment ranks them by acceptability, not all as equally good.
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Why the Source Counts 18
Ṣifah Mushabbahah: Stable Qualities, Government and 18 Patterns
2 × 3 × 3 = 18
The theoretical grid is 2 adjective definiteness types × 3 dependent forms × 3 dependent cases = 18. The traditional treatment ranks them by acceptability, not all as equally good.