When ḍaṭ follows, tithuk is the augment of the words 1. bahu 2. pūga 3. gaṇa and 4. saṅgagha,
The word डटि is understood here also. The words पूग and संघ are not Numerals; they take the affix डट् by virtue of this sutra. Thus बहूनां पूरणो = बहुतिथः, पूगतिथः, गणतिथः, and संघतिथः ॥,