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Something I always do when covering generic fns is I like to show the monomorphized versions of `pick` to make it clear to students what generics are doing behind the scenes. In my most recent class I tried going the other way around, showing the monomorphized versions first to more clearly motivate what generics are used for, and I liked the way it went. I think motivating generics by first showing code duplication and then showing how generics allow us to de-duplicate makes for a good teaching flow, and I think it also helps make things clearer to students coming from more dynamic languages that don't have an equivalent to generics. I also changed the `pick` fns to take a `bool` as the first argument because I think that makes things slightly clearer/cleaner, but I'm not married to that change either.