package Ġorg . wicket . call tree . model Ċ Ċ import Ġcom . tw ilio . type . PhoneNumber Ċ Ċ data Ġclass ĠRe cipient ( val Ġreceiver : ĠPhone Number , Ġval Ġmessage : ĠString , Ġval Ġsender : ĠPhone Number )