diff --git a/ALGA/05_BinarisKeresoFa.cs b/ALGA/05_BinarisKeresoFa.cs
new file mode 100644
index 0000000..95a26b1
--- /dev/null
+++ b/ALGA/05_BinarisKeresoFa.cs
@@ -0,0 +1,40 @@
+using System;
+
+namespace OE.ALGA;
+
+public class FaElem<T> where T : IComparable
+{
+    public T tart;
+    public FaElem<T>? bal;
+    public FaElem<T>? jobb;
+
+    public FaElem(T tart, FaElem<T>? bal, FaElem<T>? jobb)
+    {
+        this.tart = tart;
+        this.bal = bal;
+        this.jobb = jobb;
+    }
+}
+public class FaHalmaz<T> : Halmaz<T> where T : IComparable
+{
+    FaElem<T>? gyoker;
+    public void Bejar(Action<T> muvelet)
+    {
+        throw new NotImplementedException();
+    }
+
+    public void Beszur(T ertek)
+    {
+        throw new NotImplementedException();
+    }
+
+    public bool Eleme(T ertek)
+    {
+        throw new NotImplementedException();
+    }
+
+    public void Torol(T ertek)
+    {
+        throw new NotImplementedException();
+    }
+}