Offered a difficulty plus a set of premises, dilemma-resolving cuts down to searching for a proof tree whose root node is labelled by an answer of the situation and whose leaf nodes are labelled by premises or axioms. In the case of Horn clauses, trouble-resolving search can be carried out https://archive.vcstar.com/your-news/ventura-it-launches-academy-award-winners-web-site-ep-293019997-351775521.html