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This lecture explores the practicality and soundness of refinement types, which enhance programming language types with logical predicates for more expressive specifications. The instructor presents Liquid Haskell's refinement types, discussing their practicality, generality, expressiveness, and soundness. The lecture covers topics such as safe indexing, light properties verification, and the verification of deeper specifications like type preservation. Additionally, the lecture delves into the verification of light and deep properties using Liquid Haskell, highlighting the challenges and benefits of using refinement types in program verification.