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diff --git a/lib/Language/Elna/Backend/Intermediate.hs b/lib/Language/Elna/Backend/Intermediate.hs
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+++ b/lib/Language/Elna/Backend/Intermediate.hs
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+module Language.Elna.Backend.Intermediate
+    ( Operand(..)
+    , Quadruple(..)
+    {- , Label(..) -}
+    , Variable(..)
+    ) where
+
+import Data.Int (Int32)
+import Data.Word (Word32)
+import Data.Text (Text)
+
+newtype Variable = TempVariable Word32 -- | Variable Text
+    deriving Eq
+
+instance Show Variable
+  where
+    -- show (Variable variable) = '$' : Text.unpack variable
+    show (TempVariable variable) = '$' : show variable
+
+data Operand v
+    = IntOperand Int32
+    | VariableOperand v
+    deriving (Eq, Show)
+
+data Quadruple v
+    = StartQuadruple
+    | StopQuadruple
+    | ParameterQuadruple (Operand v)
+    | CallQuadruple Text Word32
+    | AddQuadruple (Operand v) (Operand v) v
+    | SubtractionQuadruple (Operand v) (Operand v) v
+    | NegationQuadruple (Operand v) v
+    {-| GoToQuadruple Label
+    | AssignQuadruple Operand Variable
+    | ArrayQuadruple Variable Operand Variable
+    | ArrayAssignQuadruple Operand Operand Variable
+    | ProductQuadruple Operand Operand Variable
+    | DivisionQuadruple Operand Operand Variable
+    | EqualQuadruple Operand Operand Label
+    | NonEqualQuadruple Operand Operand Label
+    | LessQuadruple Operand Operand Label
+    | GreaterQuadruple Operand Operand Label
+    | LessOrEqualQuadruple Operand Operand Label
+    | GreaterOrEqualQuadruple Operand Operand Label
+    | LabelQuadruple Label -}
+    deriving (Eq, Show)