In a compass survey work of an open traverse ABCDE shown in the figure, the bearing of the first line AB observed was not clearly written in the field. The observed bearing of the last line DE was recorded as S36°40’E. If the deflection angles are 31°50' (right) at D, 42°30' (right) at C, and 18°20' (left) at B. calculate the bearing of the first line AB.