Name the D 42 √ for when it has D 49 √ of r 12
CREATE TABLE "senate_composition_as_a_result_of_the_el" (
  "d_50_o" text,
  "d_49" text,
  "d_48" text,
  "d_47" text,
  "d_46" text,
  "d_45" text,
  "d_44" text,
  "d_43" text,
  "d_42" text,
  "d_41" text
);
SELECT "d_42" FROM "senate_composition_as_a_result_of_the_el" WHERE "d_49"='r 12';