 Which term best describes the relationship between Arvid 6 and Tendal 13?
Transcriber's Note: This etext was produced from Space Science Fiction May 1952. THE ULTROOM ERROR by JERRY SOHL Smith admitted he had made an error involving a few murders—and a few thousand years. Tendal 13. Arvid 6. He put it by the stairs, ready for use, fully loaded, leaning it against the wall next to the telephone stand. The car roared up the street, swerved toward the parkway, tires screaming, bounced over the curb and sidewalk, straight toward the child and mother. The car plunged on into a tree, hitting it a terrible blow, crumbling the car's forward end so it looked like an accordion.
 compulsory
 compulsory  symbiotic  complicated  predatory