claim: Levoamphetamine changes concentration.
evidence: Liu Ying may refer to  :. Liu Ying -LRB- prince -RRB- -LRB- died 71 AD -RRB- , son of Emperor Guangwu of Han. Liu Ying -LRB- cyclist -RRB- -LRB- born 1985 -RRB- , Chinese cross-country mountain bike racer. Liu Ying -LRB- footballer -RRB- -LRB- born 1974 -RRB- , Chinese footballer. Emperor Hui of Han -LRB- 210 BC -- 188 BC -RRB- , emperor of the Han Dynasty in China. Emperor Hui of Han. Emperor Hui of Han. Ruzi Ying -LRB- 5 -- 25 -RRB- , emperor of the Chinese Western Han Dynasty. Ruzi Ying. Ruzi Ying