Duplicate: https://www.codewars.com/kata/545cedaa9943f7fe7b000048

Thanks for a fun kata. I suggest expanding the test cases since there are several half-correct solutions.

• P is capitalized and occurs just once: "Pack my box with five dozen liquor jugs", potentially a problem for those that use an array and index using: "ch - 65"
• First 13 letters in both upper and lower case "ABCDEFGHIJKLMabcdefghijklm"; distinct characters is 26, but it's just 13 distinct letters
• 26 unique characters, none of which are letters "!@#$%^&*()_+1234567890-={}"
• Take existing pangrams and make them non-pangrams by swapping out unique-non-letter characters for targetted characters. For example: pangram.Replace("a", "!")

You could try a jumbling trick with LINQ:

string pangram = "Pack my box with five dozen liquor jugs";
string bar = string.Concat(foo.OrderBy(_ => random.Next()));
// for one run: bar = "vajuwoie nfg Pdoqsx  hluiti mzroe bkc y"