diff --git a/.gitignore b/.gitignore
index a4b4a496..3f31654b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -37,6 +37,7 @@ playground.xcworkspace
 # Add this line if you want to avoid checking in source code from Swift Package Manager dependencies.
 # Packages/
 # Package.pins
+Package.resolved
 .build/
 
 # CocoaPods
diff --git a/0068/ComposableArchitecture.playground/Contents.swift b/0068/ComposableArchitecture.playground/Contents.swift
deleted file mode 100644
index 290fa72e..00000000
--- a/0068/ComposableArchitecture.playground/Contents.swift
+++ /dev/null
@@ -1,163 +0,0 @@
-import Combine
-import SwiftUI
-
-class AppState: ObservableObject {
-  @Published var count = 0
-  @Published var favoritePrimes: [Int] = []
-  @Published var loggedInUser: User?
-  @Published var activityFeed: [Activity] = []
-
-  struct Activity {
-    let timestamp: Date
-    let type: ActivityType
-
-    enum ActivityType {
-      case addedFavoritePrime(Int)
-      case removedFavoritePrime(Int)
-    }
-  }
-
-  struct User {
-    let id: Int
-    let name: String
-    let bio: String
-  }
-}
-
-struct FavoritePrimesState {
-  var favoritePrimes: [Int]
-  var activityFeed: [AppState.Activity]
-}
-
-extension AppState {
-  var favoritePrimesState: FavoritePrimesState {
-    get {
-      FavoritePrimesState(
-        favoritePrimes: self.favoritePrimes,
-        activityFeed: self.activityFeed
-      )
-    }
-    set {
-      self.favoritePrimes = newValue.favoritePrimes
-      self.activityFeed = newValue.activityFeed
-    }
-  }
-}
-
-struct PrimeAlert: Identifiable {
-  let prime: Int
-  var id: Int { self.prime }
-}
-
-struct CounterView: View {
-  @ObservedObject var state: AppState
-  @State var isPrimeModalShown = false
-  @State var alertNthPrime: PrimeAlert?
-  @State var isNthPrimeButtonDisabled = false
-
-  var body: some View {
-    VStack {
-      HStack {
-        Button("-") { self.state.count -= 1 }
-        Text("\(self.state.count)")
-        Button("+") { self.state.count += 1 }
-      }
-      Button("Is this prime?") { self.isPrimeModalShown = true }
-      Button(
-        "What is the \(ordinal(self.state.count)) prime?",
-        action: self.nthPrimeButtonAction
-      )
-      .disabled(self.isNthPrimeButtonDisabled)
-    }
-    .font(.title)
-    .navigationBarTitle("Counter demo")
-    .sheet(isPresented: self.$isPrimeModalShown) {
-      IsPrimeModalView(state: self.state)
-    }
-    .alert(item: self.$alertNthPrime) { alert in
-      Alert(
-        title: Text("The \(ordinal(self.state.count)) prime is \(alert.prime)"),
-        dismissButton: .default(Text("Ok"))
-      )
-    }
-  }
-
-  func nthPrimeButtonAction() {
-    self.isNthPrimeButtonDisabled = true
-    nthPrime(self.state.count) { prime in
-      self.alertNthPrime = prime.map(PrimeAlert.init(prime:))
-      self.isNthPrimeButtonDisabled = false
-    }
-  }
-}
-
-struct IsPrimeModalView: View {
-  @ObservedObject var state: AppState
-
-  var body: some View {
-    VStack {
-      if isPrime(self.state.count) {
-        Text("\(self.state.count) is prime 🎉")
-        if self.state.favoritePrimes.contains(self.state.count) {
-          Button("Remove from favorite primes") {
-            self.state.favoritePrimes.removeAll(where: { $0 == self.state.count })
-            self.state.activityFeed.append(.init(timestamp: Date(), type: .removedFavoritePrime(self.state.count)))
-          }
-        } else {
-          Button("Save to favorite primes") {
-            self.state.favoritePrimes.append(self.state.count)
-            self.state.activityFeed.append(.init(timestamp: Date(), type: .addedFavoritePrime(self.state.count)))
-
-          }
-        }
-      } else {
-        Text("\(self.state.count) is not prime :(")
-      }
-    }
-  }
-}
-
-struct FavoritePrimesView: View {
-  @Binding var state: FavoritePrimesState
-
-  var body: some View {
-    List {
-      ForEach(self.state.favoritePrimes, id: \.self) { prime in
-        Text("\(prime)")
-      }
-      .onDelete { indexSet in
-        for index in indexSet {
-          let prime = self.state.favoritePrimes[index]
-          self.state.favoritePrimes.remove(at: index)
-          self.state.activityFeed.append(.init(timestamp: Date(), type: .removedFavoritePrime(prime)))
-        }
-      }
-    }
-    .navigationBarTitle("Favorite Primes")
-  }
-}
-
-struct ContentView: View {
-  @ObservedObject var state: AppState
-
-  var body: some View {
-    NavigationView {
-      List {
-        NavigationLink(
-          "Counter demo",
-          destination: CounterView(state: self.state)
-        )
-        NavigationLink(
-          "Favorite primes",
-          destination: FavoritePrimesView(state: self.$state.favoritePrimesState)
-        )
-      }
-      .navigationBarTitle("State management")
-    }
-  }
-}
-
-import PlaygroundSupport
-PlaygroundPage.current.liveView = UIHostingController(
-  rootView: ContentView(state: AppState())
-)
diff --git a/ComposableArchitecture/ComposableArchitecture.playground/Contents.swift b/ComposableArchitecture/ComposableArchitecture.playground/Contents.swift
new file mode 100644
index 00000000..e69de29b
diff --git a/0068/ComposableArchitecture.playground/Sources/Util.swift b/ComposableArchitecture/ComposableArchitecture.playground/Sources/Util.swift
similarity index 100%
rename from 0068/ComposableArchitecture.playground/Sources/Util.swift
rename to ComposableArchitecture/ComposableArchitecture.playground/Sources/Util.swift
diff --git a/0068/ComposableArchitecture.playground/contents.xcplayground b/ComposableArchitecture/ComposableArchitecture.playground/contents.xcplayground
similarity index 100%
rename from 0068/ComposableArchitecture.playground/contents.xcplayground
rename to ComposableArchitecture/ComposableArchitecture.playground/contents.xcplayground
diff --git a/ComposableArchitecture/Package.swift b/ComposableArchitecture/Package.swift
new file mode 100644
index 00000000..89f8b7a3
--- /dev/null
+++ b/ComposableArchitecture/Package.swift
@@ -0,0 +1,9 @@
+// swift-tools-version:4.2
+import PackageDescription
+
+let package = Package(
+  name: "ComposableArchitecture",
+  dependencies: [
+    .package(url: "https://github.com/pointfreeco/swift-enum-properties.git", from: "0.1.0")
+  ]
+)