Please choose the correct ending to complete the given sentence: Education and Communications: [header] How to identify a sycamore tree [title] Look for peeling bark. [step] The bark of a sycamore tree is brittle and can't withstand the rapid growth that sycamores experience. So the bark peels off frequently, and this results in a patchy, flaky appearance.

Ending1: [substeps] Another common find is flakes or debris on the bark. It could be caused by bark oils, fall pollen, even junk mail. Ending2: [title] Search for " camouflage " colors in the bark. [step] Because the older bark peels off and reveals younger bark beneath, the bark of sycamores will be a variety of colors-brown, green, tan, and white. Ending3: [title] Appreciate knots, clamps, and roots. [step] The bark and its surrounding leaves can all be knots, and actually make the tree healthier overall. Ending4: [substeps] Particularly ripe sycamores should not have any visible signs of rot that might indicate disease. The bark of the tree also should be firm to the touch, and a golden color.

Answer format: ending1/ending2/ending3/ending4