diff --git a/src/main/java/_4/_4/Chair.java b/src/main/java/_4/_4/Chair.java
new file mode 100644
index 0000000..cc85acf
--- /dev/null
+++ b/src/main/java/_4/_4/Chair.java
@@ -0,0 +1,4 @@
+package _4._4;
+
+public class Chair implements Furniture {
+}
diff --git a/src/main/java/_4/_4/Desk.java b/src/main/java/_4/_4/Desk.java
new file mode 100644
index 0000000..77914e4
--- /dev/null
+++ b/src/main/java/_4/_4/Desk.java
@@ -0,0 +1,4 @@
+package _4._4;
+
+public class Desk extends Table {
+}
diff --git a/src/main/java/_4/_4/Furniture.java b/src/main/java/_4/_4/Furniture.java
new file mode 100644
index 0000000..4f51d1e
--- /dev/null
+++ b/src/main/java/_4/_4/Furniture.java
@@ -0,0 +1,4 @@
+package _4._4;
+
+public interface Furniture {
+}
diff --git a/src/main/java/_4/_4/Office.java b/src/main/java/_4/_4/Office.java
new file mode 100644
index 0000000..a2a9ce2
--- /dev/null
+++ b/src/main/java/_4/_4/Office.java
@@ -0,0 +1,20 @@
+package _4._4;
+
+import java.util.List;
+
+public class Office extends Room {
+	private List<Desk> desks;
+	private List<Chair> chairs;
+
+	public Office(List<Furniture> furniture, List<Desk> desks, List<Chair> chairs) {
+		super(furniture);
+		if(desks.isEmpty()) {
+			throw new IllegalArgumentException("An Office must have at least 1 Desk");
+		}
+		this.desks = desks;
+		if(chairs.isEmpty()) {
+			throw new IllegalArgumentException("An Office must have at least 1 Chair");
+		}
+		this.chairs = chairs;
+	}
+}
diff --git a/src/main/java/_4/_4/Room.java b/src/main/java/_4/_4/Room.java
new file mode 100644
index 0000000..e22412a
--- /dev/null
+++ b/src/main/java/_4/_4/Room.java
@@ -0,0 +1,11 @@
+package _4._4;
+
+import java.util.List;
+
+public class Room {
+	protected List<Furniture> furniture;
+
+	public Room(List<Furniture> furniture) {
+		this.furniture = furniture;
+	}
+}
diff --git a/src/main/java/_4/_4/Table.java b/src/main/java/_4/_4/Table.java
new file mode 100644
index 0000000..b56cba9
--- /dev/null
+++ b/src/main/java/_4/_4/Table.java
@@ -0,0 +1,4 @@
+package _4._4;
+
+public class Table implements Furniture {
+}
diff --git a/src/main/java/_4/_4/Test.java b/src/main/java/_4/_4/Test.java
new file mode 100644
index 0000000..b077fcc
--- /dev/null
+++ b/src/main/java/_4/_4/Test.java
@@ -0,0 +1,13 @@
+package _4._4;
+
+import java.util.Arrays;
+
+public class Test {
+	public static void main(String[] args) {
+		Office office = new Office(
+				Arrays.asList(new Chair()),
+				Arrays.asList(new Desk()),
+				Arrays.asList(new Chair())
+		);
+	}
+}