package Ġchar lie . lap lac ian . track . grouping Ċ Ċ import Ġchar lie . lap lac ian . track . Track Ċ import Ġchar lie . lap lac ian . track . property . Property Ċ Ċ interface ĠTrack Grouping Method Ġ{ ĊĠĠĠ Ġfun ĠgetName (): ĠString ĊĠĠĠ Ġfun Ġget Tracks (): ĠList < Track > ĊĠĠĠ Ġfun Ġadd Track ( track : ĠTrack ) ĊĠĠĠ Ġfun Ġremove Track ( track : ĠTrack ) ĊĠĠĠ Ġfun Ġcan Duplicate (): ĠBoolean ĊĠĠĠ Ġfun Ġcount (): ĠInt ĊĠĠĠ Ġfun Ġget Properties (): ĠList < Property <* >> Ċ }