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Trace: Add by 2
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Add by 2
2
+
1
=
3
2
+
2
=
4
2
+
3
=
5
2
+
4
=
6
2
+
5
=
7
2
+
6
=
8
2
+
7
=
9
2
+
8
=
10
2
+
9
=
11
1
+
2
=
3
2
+
2
=
4
3
+
2
=
5
4
+
2
=
6
5
+
2
=
7
6
+
2
=
8
7
+
2
=
9
8
+
2
=
10
9
+
2
=
11
Quiz: Add by 2
2
+
3
=
2
+
2
=
8
+
2
=
2
+
4
=
7
+
2
=
2
+
7
=
6
+
2
=
2
+
9
=
5
+
2
=
4
+
2
=
3
+
2
=
1
+
2
=
2
+
5
=
2
+
6
=
9
+
2
=
2
+
8
=
2
+
1
=
2
+
2
=