Edna Krabappel-Flanders is a fictional character from the animated television series "The Simpsons", who was voiced by Marcia Wallace until her death in 2013. She is the teacher of Bart Simpson's 4th grade class at Springfield Elementary School, and Ned Flanders's wife in later seasons. Using only the above description and what you know about the world, "Edna Krabappel-Flanders was married to Ned Flanders since the beginning of the Simpsons." is definitely correct, incorrect, or inconclusive? 