Probing [hs/ls] as a classifier of CEMP-s and CEMP-r/s stars. The filled red circles represent CEMP-r/s stars, filled black squares represent CEMP-s stars, and filled blue triangles and filled green pentagons respectively represent CEMP-s and CEMP-r/s stars in this work. Panel a: μ and σ represent the mean and standard deviation of [hs/ls] respectively for CEMP-s and CEMP-r/s stars. Panel c: short-dashed black line represents the correlation between [hs/Fe] and [Eu/Fe] for CEMP-s and CEMP-r/s stars. Panel d: short-dashed black line and long-dashed red line represent the correlation between [hs/Fe] and [ls/Fe] for CEMP-s and CEMP-r/s stars, respectively.