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


'abcdefghijklmnopqrstuvwxyz 'FULL s:const
'__________________________ 'TEST s:const
:s:pangram? (s-f)
  '__________________________ &TEST #26 copy
  s:to-lower [ c:letter? ] s:filter
  [ dup $a - &TEST + store ] s:for-each
  &TEST &FULL s:eq? ;
 