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Start in the bottom left corner and move either up or right, one square at a time, using the numbers and the mathematical signs along the way. What is the largest total you can make?
+
2
−
4
+
2
2
+
2
−
2
+
−
1
+
3
−
3
2
−
3
+
1
−
+
1
−
3
+
2
3
+
3
−
2
+
Note: this puzzle is not interactive, and the numbers cannot be clicked.