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diff --git a/src/Tests/Cardinal.hs b/src/Tests/Cardinal.hs
deleted file mode 100644
index 7d4cfde..0000000
--- a/src/Tests/Cardinal.hs
+++ /dev/null
@@ -1,192 +0,0 @@
-module Tests.Cardinal
-where
-
-import Prelude hiding (LT)
-import Test.HUnit
-import Test.QuickCheck (Property, (==>))
-
-import Cardinal
-
--- | We know what (c t6 2 1 0 0) should be from Sorokina and
---   Zeilfelder, p. 87.  This test checks that the directions are
---   rotated properly.  The order of the letters has to be just right
---   since I haven't defined a proper Eq instance for Cardinals.
-test_c_tilde_2100_rotation_correct :: Assertion
-test_c_tilde_2100_rotation_correct =
-    assertEqual "auto-rotate equals manual rotate" ((ccwz . ccwz . cwy) expr1) expr2
-    where
-      expr1 =
-          (3/8)*I +
-          (1/12)*(T + R + L + D) +
-          (1/64)*(FT + FR + FL + FD) +
-          (7/48)*F +
-          (1/48)*B +
-          (1/96)*(RT + LD + LT + RD) +
-          (1/192)*(BT + BR + BL + BD)
-
-      expr2 =
-          (3/8)*I +
-          (1/12)*(F + L + R + B) +
-          (1/64)*(FT + LT + RT + BT) +
-          (7/48)*T +
-          (1/48)*D +
-          (1/96)*(FL + BR + FR + BL) +
-          (1/192)*(FD + LD + RD + BD)
-
--- | A list of all directions, sans the interior and composite types.
-all_directions :: [Cardinal]
-all_directions = [L, R, F, B, D, T, FL, FR, FD, FT,
-                  BL, BR, BD, BT, LD, LT, RD, RT, FLD,
-                  FLT, FRD, FRT, BLD, BLT, BRD, BRT]
-
-
--- | If we rotate a direction (other than front or back)
---   counter-clockwise with respect to the x-axis, we should get a new
---   direction.
-prop_ccwx_rotation_changes_direction :: Cardinal -> Property
-prop_ccwx_rotation_changes_direction c =
-    c `elem` [L, R, D, T, FL, FR, FD, FT, BL, BR, BD, BT, LD, LT,
-               RD, RT, FLD, FLT, FRD, FRT, BLD, BLT, BRD, BRT]
-          ==> ccwx c /= c
-
--- | If we rotate a direction (other than front or back) clockwise
---   with respect to the x-axis, we should get a new direction.
-prop_cwx_rotation_changes_direction :: Cardinal -> Property
-prop_cwx_rotation_changes_direction c =
-    -- The front and back faces are unchanged by x-rotation.
-    c `elem` [L, R, D, T, FL, FR, FD, FT, BL, BR, BD, BT, LD, LT,
-               RD, RT, FLD, FLT, FRD, FRT, BLD, BLT, BRD, BRT]
-          ==> cwx c /= c
-
--- | If we rotate a direction (other than left or right)
---   counter-clockwise with respect to the y-axis, we should get a new
---   direction.
-prop_ccwy_rotation_changes_direction :: Cardinal -> Property
-prop_ccwy_rotation_changes_direction c =
-    c `elem` [F, B, D, T, FL, FR, FD, FT, BL, BR, BD, BT, LD, LT,
-               RD, RT, FLD, FLT, FRD, FRT, BLD, BLT, BRD, BRT]
-          ==> ccwy c /= c
-
-
--- | If we rotate a direction (other than left or right) clockwise
---   with respect to the y-axis, we should get a new direction.
-prop_cwy_rotation_changes_direction :: Cardinal -> Property
-prop_cwy_rotation_changes_direction c =
-    c `elem` [F, B, D, T, FL, FR, FD, FT, BL, BR, BD, BT, LD, LT,
-               RD, RT, FLD, FLT, FRD, FRT, BLD, BLT, BRD, BRT]
-          ==> cwy c /= c
-
-
--- | If we rotate a direction (other than top or down)
---   counter-clockwise with respect to the z-axis, we should get a new
---   direction.
-prop_ccwz_rotation_changes_direction :: Cardinal -> Property
-prop_ccwz_rotation_changes_direction c =
-    c `elem` [L, R, F, B, FL, FR, FD, FT, BL, BR, BD, BT, LD, LT,
-               RD, RT, FLD, FLT, FRD, FRT, BLD, BLT, BRD, BRT]
-          ==> ccwz c /= c
-
-
--- | If we rotate a direction (other than top or down) clockwise with
---   respect to the z-axis, we should get a new direction.
-prop_cwz_rotation_changes_direction :: Cardinal -> Property
-prop_cwz_rotation_changes_direction c =
-    c `elem` [L, R, F, B, FL, FR, FD, FT, BL, BR, BD, BT, LD, LT,
-               RD, RT, FLD, FLT, FRD, FRT, BLD, BLT, BRD, BRT]
-          ==> cwz c /= c
-
-
--- | If we are given a direction c, there should only be one direction
---   d which, when rotated counter-clockwise with respect to the
---   x-axis, produces c.
-prop_ccwx_rotation_result_unique :: Cardinal -> Property
-prop_ccwx_rotation_result_unique c =
-    c `elem` all_directions ==>
-          (length [ d | d <- all_directions, ccwx d == c ]) == 1
-
--- | If we are given a direction c, there should only be one direction
---   d which, when rotated clockwise with respect to the x-axis,
---   produces c.
-prop_cwx_rotation_result_unique :: Cardinal -> Property
-prop_cwx_rotation_result_unique c =
-    c `elem` all_directions ==>
-          (length [ d | d <- all_directions, cwx d == c ]) == 1
-
-
--- | If we are given a direction c, there should only be one direction
---   d which, when rotated counter-clockwise with respect to the
---   y-axis, produces c.
-prop_ccwy_rotation_result_unique :: Cardinal -> Property
-prop_ccwy_rotation_result_unique c =
-    c `elem` all_directions ==>
-          (length [ d | d <- all_directions, ccwy d == c ]) == 1
-
-
--- | If we are given a direction c, there should only be one direction
---   d which, when rotated clockwise with respect to the y-axis,
---   produces c.
-prop_cwy_rotation_result_unique :: Cardinal -> Property
-prop_cwy_rotation_result_unique c =
-    c `elem` all_directions ==>
-          (length [ d | d <- all_directions, cwy d == c ]) == 1
-
-
--- | If we are given a direction c, there should only be one direction
---   d which, when rotated counter-clockwise with respect to the
---   z-axis, produces c.
-prop_ccwz_rotation_result_unique :: Cardinal -> Property
-prop_ccwz_rotation_result_unique c =
-    c `elem` all_directions ==>
-          (length [ d | d <- all_directions, ccwz d == c ]) == 1
-
-
--- | If we are given a direction c, there should only be one direction
---   d which, when rotated clockwise with respect to the z-axis,
---   produces c.
-prop_cwz_rotation_result_unique :: Cardinal -> Property
-prop_cwz_rotation_result_unique c =
-    c `elem` all_directions ==>
-          (length [ d | d <- all_directions, cwz d == c ]) == 1
-
-
--- | If you rotate a cardinal direction four times in the clockwise
---   (with respect to x) direction, you should wind up with the same
---   direction.
-prop_four_cwx_is_identity :: Cardinal -> Bool
-prop_four_cwx_is_identity c =
-    (cwx . cwx . cwx . cwx) c == c
-
--- | If you rotate a cardinal direction four times in the
---   counter-clockwise (with respect to x) direction, you should wind up
---   with the same direction.
-prop_four_ccwx_is_identity :: Cardinal -> Bool
-prop_four_ccwx_is_identity c =
-    (ccwx . ccwx . ccwx . ccwx) c == c
-
--- | If you rotate a cardinal direction four times in the clockwise
---   (with respect to y) direction, you should wind up with the same
---   direction.
-prop_four_cwy_is_identity :: Cardinal -> Bool
-prop_four_cwy_is_identity c =
-    (cwy . cwy . cwy . cwy) c == c
-
--- | If you rotate a cardinal direction four times in the counter-clockwise
---   (with respect to y) direction, you should wind up with the same
---   direction.
-prop_four_ccwy_is_identity :: Cardinal -> Bool
-prop_four_ccwy_is_identity c =
-    (ccwy . ccwy . ccwy . ccwy) c == c
-
--- | If you rotate a cardinal direction four times in the clockwise
---   (with respect to z) direction, you should wind up with the same
---   direction.
-prop_four_cwz_is_identity :: Cardinal -> Bool
-prop_four_cwz_is_identity c =
-    (cwz . cwz . cwz . cwz) c == c
-
--- | If you rotate a cardinal direction four times in the
---   counter-clockwise (with respect to z) direction, you should wind up
---   with the same direction.
-prop_four_ccwz_is_identity :: Cardinal -> Bool
-prop_four_ccwz_is_identity c =
-    (ccwz . ccwz . ccwz . ccwz) c == c