what is the debut when the play er is radoslava topalova and the years played is less than 2?
CREATE TABLE "team_representatives" (
  "player" text,
  "w_l_total" text,
  "w_l_singles" text,
  "w_l_doubles" text,
  "ties" real,
  "debut" real,
  "years_played" real
);
SELECT AVG("debut") FROM "team_representatives" WHERE "player"='radoslava topalova' AND "years_played"<2;