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| // simple Member class | |
| case class Member(id: String, name: String, points: Long) | |
| // member types | |
| trait MemberType {val member: Member} | |
| case class FirstTimer(member: Member) extends MemberType | |
| case class FrequentShopper(member: Member) extends MemberType | |
| case class Patron(member: Member) extends MemberType | |
| // membership card | |
| abstract class MembershipCard(member: Member, levelName: String) | |
| case class Silver(member: Member) extends MembershipCard(member,"silver") | |
| case class Gold(member: Member) extends MembershipCard(member,"gold") | |
| case class Platinum(member: Member) extends MembershipCard(member,"platinum") |
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