Added third field to tuple

src/tuple/Tuple.java

-package tuple;
-
-public class Tuple<T1, T2> {
-	T1 fst;
-	T2 snd;
-	
-	public Tuple(T1 fst, T2 snd) {
-		this.fst = fst;
-		this.snd = snd;
-	}
-	
-	public T1 fst() {
-		return fst;
-	}
-	
-	public T2 snd() {
-		return snd;
-	}
-}
+package tuple;
+
+public class Tuple<T1, T2, T3> {
+	T1 fst;
+	T2 snd;
+	T3 trd;
+	
+	public Tuple(T1 fst, T2 snd,T3 trd) {
+		this.fst = fst;
+		this.snd = snd;
+		this.trd= trd;
+	}
+	
+	public T1 fst() {
+		return fst;
+	}
+	
+	public T2 snd() {
+		return snd;
+	}
+	public T3 trd() {
+		return trd;
+	}
+}