Sync exercises (exercism#351)

Author: keiravillekode

exercises/practice/isbn-verifier/.meta/tests.toml

@@ -30,6 +30,12 @@ description = "invalid character in isbn is not treated as zero"
 [28025280-2c39-4092-9719-f3234b89c627]
 description = "X is only valid as a check digit"
 
+[8005b57f-f194-44ee-88d2-a77ac4142591]
+description = "only one check digit is allowed"
+
+[fdb14c99-4cf8-43c5-b06d-eb1638eff343]
+description = "X is not substituted by the value 10"
+
 [f6294e61-7e79-46b3-977b-f48789a4945b]
 description = "valid isbn without separating dashes"
 

exercises/practice/isbn-verifier/test.sml

@@ -29,6 +29,12 @@ val testsuite =
     test "X is only valid as a check digit"
       (fn _ => isValid "3-598-2X507-9" |> Expect.falsy),
 
+    test "only one check digit is allowed"
+      (fn _ => isValid "3-598-21508-96" |> Expect.falsy),
+
+    test "X is not substituted by the value 10"
+      (fn _ => isValid "3-598-2X507-5" |> Expect.falsy),
+
     test "valid isbn without separating dashes"
       (fn _ => isValid "3598215088" |> Expect.truthy),
 

exercises/practice/line-up/.docs/instructions.md

@@ -5,9 +5,9 @@ Yaʻqūb expects to use numbers from 1 up to 999.
 
 Rules:
 
-- Numbers ending in 1 (except for 11) → `"st"`
-- Numbers ending in 2 (except for 12) → `"nd"`
-- Numbers ending in 3 (except for 13) → `"rd"`
+- Numbers ending in 1 (unless ending in 11) → `"st"`
+- Numbers ending in 2 (unless ending in 12) → `"nd"`
+- Numbers ending in 3 (unless ending in 13) → `"rd"`
 - All other numbers → `"th"`
 
 Examples: