What is the decay constant with a half-life less than 22.72, a yield, neutrons per fission of 0.0031000000000000003, and a group number less than 3?
CREATE TABLE "principle" (
  "group" real,
  "half_life_s" real,
  "decay_constant_s_1" real,
  "yield_neutrons_per_fission" real,
  "fraction" real
);
SELECT COUNT("decay_constant_s_1") FROM "principle" WHERE "half_life_s"<22.72 AND "yield_neutrons_per_fission"=0.0031000000000000003 AND "group"<3;