$19.$ Defects Liability Period: How do you manage the Defects Liability Period in accordance with the GCC $2015$ contract, and can you provide an example wher your approach to defect management led to the timely rectification of issues and client satisfaction?

$20.$ Value Engineering: How do you incorporate value engineering principles within the GCC $2015$ contract to identify cost$-$saving opportunities and optimize outcomes, and can you provide an example where your application of value engineering resulted in significant cost savings without compromising project quality?