M(k) = 0.98 · Πᵢ₌₁..k (49−i+1)/(49−S−i+1), S=3  ·  shorts = top52(sha256(seed + ":shorts:" + n + ":" + j)) mod 49 with rejection of out-of-range and duplicate draws  ·  RTP 98% at every stopping rule  ·  production: seed chain committed on Elysium before each round