due to the new fences added into minecraft, the crafting recipe has been changed. This, however, has caused an imbalance in the cost of fences. Previously, the recipe was 6 sticks for 2 fences, with fences costing 3 sticks each. The new recipe is 10 sticks (4 planks, 2 sticks) for 3 fences, so fences cost 3.33333... sticks each. To fix this, 3 planks and 3 sticks can be used instead of 4 planks and 2 sticks. So 9 sticks (3 planks, 3 sticks) for 3 fences, keeping the original cost of 3 sticks per fence.