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Re:Programming an HP-15C (2013) by a_e_k on Tuesday February 04, 2020 @03:43PM (#22240734)
I've typically seen A-F rendered like so:

   _         _        _   _
  |_|  |_   |    _|  |_  |_
  | |  |_|  |_  |_|  |_  |
(Variations would be a double-story lower case 'a' and lower case 'c'.)
Re:Programming an HP-15C (2013) by kps on Tuesday February 04, 2020 @04:01PM (#22240915)
But if they cloned the 7447 decoder they'd look like

                   _     
     _    _   |_| |_   |_ 
    |_    _|       _   |_
with 15 blank.