Recently I read Immortal Coil, and by the way really enjoyed it. In the book it is stated that in his lab Data has this "crypt" with all the other androids. Besides Lore, Lal and the newly added Juliana there are these 3 failed prototypes. It is said that Data found these prototypes some months before the events of this book. Is this something the author just made up (assuming story-wise the back then yet unknown B-4 was the fourth prototype before Lore)? Or is there an actual novel or comic that tells this particular story?