package Ġarrow io . service Ċ Ċ import Ġarrow . fx . For IO Ċ import Ġarrow . mt l . Either TP art ial Of Ċ import Ġarrow . mt l . K le is li Ċ import Ġarrow io . repository . Account Repository Ċ Ċ type alias ĠReport Operation < A > Ġ= ĠK le is li < Account Repository , ĠEither TP art ial Of < Account ServiceException , ĠFor IO >, ĠA > Ċ Ċ interface ĠReporting Service < Amount > Ġ{ ĊĊĠĠĠ Ġfun Ġbalance By Account (): ĠReport Operation < Sequence < Pair < String , ĠAmount >>> Ċ }