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+definition module StamBoom
+
+import GenTree
+
+:: FamilyTree :== GenTree Couple Single
+:: Couple = Couple Person Person
+:: Single = Single Person
+:: Person = Person DateOfBirth Gender String
+:: Gender = Male | Female
+:: DateOfBirth = DoB Year Month Day
+:: Year :== Int
+:: Month :== Int
+:: Day :== Int
+
+instance < DateOfBirth
+instance == DateOfBirth
+instance == Couple
+instance == Person
+instance == Gender
+
+okFamilyTree :: FamilyTree -> Bool
+rootAncestor :: FamilyTree -> Person
+inFamilyTree :: Person FamilyTree -> Bool
+marry :: Person Person FamilyTree -> FamilyTree
+addChild :: Person Couple FamilyTree -> FamilyTree
+children :: Person FamilyTree -> [Person]
+offspring :: Person FamilyTree -> [Person]