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diff --git a/files/practicum/LijstOverloading.icl b/files/practicum/LijstOverloading.icl
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+implementation module LijstOverloading
+
+import StdEnv, LijstGenerator
+
+instance zero [a] | zero a where 
+instance one  [a] | one  a where 
+instance ~    [a] | ~    a where 
+instance +    [a] | +    a where 
+instance -    [a] | -    a where 
+instance *    [a] | *    a where 
+instance /    [a] | /    a where 
+
+Start  = (test [1,2,3], test [1.0,2.0,3.0])
+
+test a = ( zero + a == a && a == a + zero
+         , a - zero == a && a == ~ (zero - a)
+         ,  one * a == a && a == a * one
+         ,  a / one == a
+         ,  ~ (~ a) == a
+         )