package Ġpro . b atal in . coin keeper . importer . data Ċ Ċ import Ġpro . b atal in . coin keeper . importer . category . Category Ċ import Ġpro . b atal in . coin keeper . importer . transaction . Transaction Ċ import Ġjava . io . Reader Ċ Ċ interface ĠSource DataReader Ġ{ ĊĠĠĠ Ġfun Ġread ( reader : ĠReader , Ġcoin Keeper Categories : ĠList < Category >): ĠSequence < Transaction > Ċ } Ċ