Add your own abstraction layer: "The Y combinator allows us to define [1] in computer languages that do not have built-in support for [2], but that do support

Add your own abstraction layer: "The Y combinator allows us to define [1] in computer languages that do not have built-in support for [2], but that do support first-class [3]." An example: [1] startups [2] operating costs [3] solutions Your turn!