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diff --git a/code/calculator/calc3.ml b/code/calculator/calc3.ml
index bcf15cdf..522ca287 100644
--- a/code/calculator/calc3.ml
+++ b/code/calculator/calc3.ml
@@ -1,19 +1,19 @@
 (* calc2.ml, enhanced with Recursive Function Values *)
 
 	type term =
-		  Intconstant of int
-		| Multiplication of (term * term)
-		| Addition of (term * term)
-		| Variable of char
-		| Let of (char * term * term)
-		| Iszero of term
-		| If of (term * term * term)
-		| Makepair of (term * term)
-		| First of term
-		| Lambda of (char * term)
-		| Apply of (term * term)
-		| Letrec of (char * term * term)
-        ;;
+      Intconstant of int
+    | Multiplication of (term * term)
+    | Addition of (term * term)
+    | Variable of char
+    | Let of (char * term * term)
+    | Iszero of term
+    | If of (term * term * term)
+    | Makepair of (term * term)
+    | First of term
+    | Lambda of (char * term)
+    | Apply of (term * term)
+    | Letrec of (char * term * term)
+    ;;
 
     type bound_value = Nonrecursive of expressed_value | Recursive_Closure of char * char * term * assignment
 	and assignment = (char * bound_value) list