Notification amendment updates goods classification to include fly ash bricks, aggregates and blocks under state GST rules. Substitutes the Table entry at serial number four in the prior notification to read 'Fly ash bricks; Fly ash aggregates; Fly ash blocks' pursuant to powers under sub section (2) of Section 23 of the Tamil Nadu Goods and Services Tax Act, 2017, and declares the amendment to be deemed in force from the stated earlier date.