@@ -0,0 +1,412 @@
+package seedu.tasklist.model;%0A%0A%0A//@author A0139747N%0A/**%0A * Creates a Pair object which will be used for undo/redo command.%0A */%0Apublic class Pair%3CA, B%3E %7B%0A    private A first;%0A    private B second;%0A%0A    public Pair(A first, B second) %7B%0A        this.first = first;%0A        this.second = second;%0A    %7D%0A%0A    public A getFirst() %7B%0A        return first;%0A    %7D%0A%0A    public B getSecond() %7B%0A        return second;%0A    %7D%0A%7D%0A

Create Pair class