sentence: at the top of the trunk , it abruptly narrows into one or several cylindrical branch that are 30 cm ( 11.81-inch ) to 50 ( 19.69-inch ) cm by 4 cm ( 1.58-inch ) by 8 cm ( 3.15-inch ) in diameter , tapering to 3 cm ( 3.15-inch ) to 4 cm ( 1.58-inch ) in diameter .