Input (grade 13): Fontella Bass Chuck Berry Henry Brown Teddy Darby Walter Davis Donny Hathaway James "Stump" Johnson Johnnie Johnson Lonnie Johnson Albert King Robert Lockwood, Jr..
Output (grade 12): St. Louis blues artists Fontella Bass Chuck Berry Henry Brown Teddy Darby Walter Davis Donny Hathaway Johnnie Johnson Lonnie Johnson Albert King Robert Lockwood, Jr..