What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: Joseph is not an artist. For all y_4, y_4 is an artist if and only if y_4 is fast. James is a writer if and only if Joseph is fast. It is late if and only if James is a writer.
If James were a writer, then Joseph is fast can be inferred via the biconditional elimination rule. If it is late, then James is a writer can be inferred via the biconditional elimination rule. If Joseph were fast, then James is a writer can be inferred via the biconditional elimination rule. If James were a writer, then it is late can be inferred via the biconditional elimination rule. For all y_4, if y_4 were an artist, then y_4 is fast can be inferred via the universal biconditional elimination rule. For all y_4, if y_4 were fast, then y_4 is an artist can be inferred via the universal biconditional elimination rule.