Problems of trineutron (15)

20785 life and death 20783 life and death 20228 life and death 20219 life and death 20218 life and death 20217 life and death 20204 life and death 20203 elementary 19764 tesuji 18336 life and death 18335 life and death 18308 life and death 18307 life and death 18271 life and death 18234 life and death