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diff --git a/files/practicum/StdStack.icl b/files/practicum/StdStack.icl
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+++ b/files/practicum/StdStack.icl
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+implementation module StdStack
+
+import StdEnv
+
+:: Stack a
+
+Start  = ( "s0 = newStack = ",        s0,'\n'
+         , "s1 = push 1 s0 = ",       s1,'\n'
+         , "s2 = pushes [2..5] s1 = ",s2,'\n'
+         , "s3 = pop s2 = ",          s3,'\n'
+         , "s4 = popn 3 s3 = ",       s4,'\n'
+         , "s5 = top s4 = ",          s5,'\n'
+         , "s6 = topn 3 s2 = ",       s6,'\n'
+         , "s7 = elements s2 = ",     s7,'\n'
+         )
+where
+	s0 = newStack
+	s1 = push 1 s0
+	s2 = pushes [2..5] s1
+	s3 = pop s2
+	s4 = popn 3 s3
+	s5 = top s4
+	s6 = topn 3 s2
+	s7 = elements s2