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diff --git a/src/Tests/Cube.hs b/src/Tests/Cube.hs
index 418730a..295eaa6 100644
--- a/src/Tests/Cube.hs
+++ b/src/Tests/Cube.hs
@@ -274,6 +274,55 @@ prop_c0120_identity1 cube =
        t3 = tetrahedron3 cube
 
 
+-- | Given in Sorokina and Zeilfelder, p. 79. Repeats
+--   prop_c0120_identity2 with tetrahedrons 3 and 2.
+prop_c0120_identity2 :: Cube -> Bool
+prop_c0120_identity2 cube =
+   c t3 0 1 2 0 ~= (c t3 0 0 2 1 + c t2 0 0 1 2) / 2
+     where
+       t3 = tetrahedron3 cube
+       t2 = tetrahedron2 cube
+
+-- | Given in Sorokina and Zeilfelder, p. 79. Repeats
+--   prop_c0120_identity1 with tetrahedrons 2 and 1.
+prop_c0120_identity3 :: Cube -> Bool
+prop_c0120_identity3 cube =
+   c t2 0 1 2 0 ~= (c t2 0 0 2 1 + c t1 0 0 1 2) / 2
+     where
+       t2 = tetrahedron2 cube
+       t1 = tetrahedron1 cube
+
+
+-- | Given in Sorokina and Zeilfelder, p. 79. Repeats
+--   prop_c0120_identity1 with tetrahedrons 4 and 7.
+prop_c0120_identity4 :: Cube -> Bool
+prop_c0120_identity4 cube =
+   c t4 0 1 2 0 ~= (c t4 0 0 2 1 + c t7 0 0 1 2) / 2
+     where
+       t4 = tetrahedron4 cube
+       t7 = tetrahedron7 cube
+
+
+-- | Given in Sorokina and Zeilfelder, p. 79. Repeats
+--   prop_c0120_identity1 with tetrahedrons 7 and 6.
+prop_c0120_identity5 :: Cube -> Bool
+prop_c0120_identity5 cube =
+   c t7 0 1 2 0 ~= (c t7 0 0 2 1 + c t6 0 0 1 2) / 2
+     where
+       t7 = tetrahedron7 cube
+       t6 = tetrahedron6 cube
+
+
+-- | Given in Sorokina and Zeilfelder, p. 79. Repeats
+--   prop_c0120_identity1 with tetrahedrons 6 and 5.
+prop_c0120_identity6 :: Cube -> Bool
+prop_c0120_identity6 cube =
+   c t6 0 1 2 0 ~= (c t6 0 0 2 1 + c t5 0 0 1 2) / 2
+     where
+       t6 = tetrahedron6 cube
+       t5 = tetrahedron5 cube
+
+
 -- | Given in Sorokina and Zeilfelder, p. 79. Note that the third and
 --   fourth indices of c-t3 have been switched. This is because we
 --   store the triangles oriented such that their volume is