Question: KAI KF-X was the model that followed which South Korean supersonic trainers and combat aircraft?
Sentence (from "KAI KF-X"): The Korea Aerospace Industries KF-X/Indonesian Aerospace IF-X is a South Korean and Indonesian program to develop an advanced multirole fighter for the Republic of Korea Air Force (ROKAF) and Indonesian Air Force (TNI-AU), spearheaded by South Korea with Indonesia as the primary partner.
Relevant evidence: No