anchor.diff:  let ``Duplicated character in the middle`` () =
       isIsogram "accentor" |> should equal false
   
  +[<Fact(Skip = "Remove to run test")>]
  +let ``Same first and last characters`` () =
  +    isIsogram "angola" |> should equal false
  +
  
positive.code:     isIsogram "Alphabet" |> should equal false
  
  [<Fact(Skip = "Remove to run test")>]
  let ``Hypothetical isogrammic word with hyphen`` () =
      isIsogram "thumbscrew-japingly" |> should equal true
  
  
negative.code: // This file was auto-generated based on version 1.6.0 of the canonical data.
  
  module IsogramTest
  
  