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: For all x_7, x_7 is a lawyer if and only if x_7 will listen to a song. For all x_7, x_7 is an artist if and only if x_7 is a lawyer. For all x_7, x_7 will take a plane if and only if x_7 will listen to a song. For all x_7, x_7 is not an artist.
For all x_7, if x_7 were a lawyer, then x_7 is listening to a song can be inferred via the universal biconditional elimination rule. For all x_7, if x_7 were an artist, then x_7 is a lawyer can be inferred via the universal biconditional elimination rule. For all x_7, if x_7 takes a plane, then x_7 is listening to a song can be inferred via the universal biconditional elimination rule. For all x_7, if x_7 listens to a song, then x_7 is a lawyer can be inferred via the universal biconditional elimination rule. For all x_7, if x_7 were a lawyer, then x_7 is an artist can be inferred via the universal biconditional elimination rule. For all x_7, if x_7 listens to a song, then x_7 is taking a plane can be inferred via the universal biconditional elimination rule. For all x_7, x_7 is not a lawyer can be inferred via the universal biconditional elimination rule.