Input (grade 13): In a 1999 interview, Rowling stated that Draco is based on several prototypical schoolyard bullies she encountered and Snape on a sadistic teacher of hers who abused his power.
Output (grade 12): In a 1999 interview, Rowling stated that Draco is based on several schoolyard bullies she had known and Snape on a teacher of hers who abused his power.