Pangram checker

You are encouraged to solve this task according to the task description, using any language you may know.
A pangram is a sentence that contains all the letters of the English alphabet at least once.

For example:   The quick brown fox jumps over the lazy dog.



Task

Write a function or method to check a sentence to see if it is a   pangram   (or not)   and show its use.



Related tasks

   determine if a string has all the same characters
   determine if a string has all unique characters


to remove.all :s :set
  if empty? :s [output :set]
  if word? :s [output remove.all butfirst :s remove first :s :set]
  output remove.all butfirst :s remove.all first :s :set
end
to pangram? :s
  output empty? remove.all :s "abcdefghijklmnopqrstuvwxyz
end
 
show pangram? [The five boxing wizards jump quickly.]   ; true