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diff --git a/assignment-13/uFPL/Sim.dcl b/assignment-13/uFPL/Sim.dcl
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+definition module uFPL.Sim
+
+import iTasks
+
+import uFPL
+from uFPL.C import :: Signedness
+
+:: UFPLException
+	= LiftException String
+	| NoShareException ISharedRef
+	| WriteToROShare ISharedRef
+
+instance toString UFPLException
+
+class lift a :: a -> Task Dynamic
+class unlift a b :: b -> a
+
+:: ReadOrWrite = ReadOnly | ReadWrite
+
+:: ISharedInt =
+	{ iisname :: String
+	, iisinit :: Int
+	, iisrw   :: ReadOrWrite
+	}
+
+:: ISharedRef :== String
+
+:: IShares =
+	{ ishares :: [ISharedInt]
+	}
+
+:: IExpr
+	= ILitInt  Int
+	| ILitBool Bool
+	| ILitChar Char
+	| IShared ISharedRef
+	| IAdd IExpr IExpr
+	| ISub IExpr IExpr
+	| IMul IExpr IExpr
+	| IDiv IExpr IExpr
+	| IEq  IExpr IExpr
+	| ILt  IExpr IExpr
+	| IAnd IExpr IExpr
+	| IOr  IExpr IExpr
+	| IIf  IExpr IExpr IExpr
+
+:: ITrigger
+	= IChange ISharedRef
+	| IBecomes ISharedRef IExpr
+	| ITAnd ITrigger ITrigger
+	| ITOr ITrigger ITrigger
+
+:: IRule
+	= IAssign ISharedRef IExpr
+	| IWhen IExpr [IRule]
+	| ITrigger ITrigger [IRule]
+	| ISetCursor (IExpr, IExpr)
+	| IPrint IExpr
+
+:: INamedRule = Rule String [IRule]
+
+derive class iTask Signedness, CType, ReadOrWrite, ISharedInt, IShares, IExpr,
+	ITrigger, IRule, INamedRule
+
+instance lift [a] | lift a
+instance unlift [a] [b] | unlift a b
+instance lift IExpr
+instance unlift IExpr (Expr t rw) | Expr t
+instance lift ISharedInt
+instance unlift ISharedInt (UShared Int rw)
+instance lift ITrigger
+instance unlift ITrigger Trigger
+instance lift IRule
+instance unlift IRule Rule
+instance lift INamedRule
+instance unlift INamedRule NamedRule
+
+simulate :: [NamedRule] -> Task ()