Sentence:This reconstruction involved track removals, conversion of each deck (lower and upper) to one-way motor vehicle traffic, and the lowering of the lower [e1]deck[/e1] of the [e2]bridge[/e2] by 16 inches through the Yerba Buena Tunnel.
 e1: deck. 
 e2 : bridge.
Answer: Component-Whole(e1,e2)