diff --git a/core/build.gradle b/core/build.gradle
index 13d06114..50515a88 100644
--- a/core/build.gradle
+++ b/core/build.gradle
@@ -6,6 +6,11 @@ ext {
 archivesBaseName = project.projectName
 
 dependencies {
+    annotationProcessor "org.derive4j:derive4j:0.13.0"
+    annotationProcessor "org.derive4j:derive4j-fj:0.2"
+    compileOnly "org.derive4j:derive4j-annotation:0.13.0"
+    compileOnly "com.google.auto.value:auto-value-annotations:1.6.2"
+    annotationProcessor "com.google.auto.value:auto-value:1.6.2"
     testCompile dependencyJunit
     testCompile 'com.h2database:h2:1.4.197'
     testCompile 'commons-dbutils:commons-dbutils:1.7'
diff --git a/core/src/main/java/fj/data/LazyList.java b/core/src/main/java/fj/data/LazyList.java
new file mode 100644
index 00000000..d00cb54c
--- /dev/null
+++ b/core/src/main/java/fj/data/LazyList.java
@@ -0,0 +1,14 @@
+package fj.data;
+
+import fj.F0;
+import fj.F2;
+import org.derive4j.Data;
+import org.derive4j.FieldNames;
+import org.derive4j.Flavour;
+
+@Data(flavour = Flavour.FJ)
+public interface LazyList<A> {
+
+  <X> X list(F0<X> nil, @FieldNames({ "head", "tail" }) F2<A, LazyList<A>, X> cons);
+
+}
diff --git a/core/src/main/java/fj/data/LazyList2.java b/core/src/main/java/fj/data/LazyList2.java
new file mode 100644
index 00000000..e2256b55
--- /dev/null
+++ b/core/src/main/java/fj/data/LazyList2.java
@@ -0,0 +1,19 @@
+package fj.data;
+
+import fj.F0;
+import fj.F2;
+import org.derive4j.Data;
+import org.derive4j.FieldNames;
+import org.derive4j.Flavour;
+
+@Data(flavour = Flavour.FJ)
+public abstract class LazyList2<A> {
+
+  interface Cases<A, X> {
+    X nil();
+    X cons(A head, LazyList2<A> tail);
+  }
+
+  public abstract <X> X list(Cases<A, X> cases);
+
+}