Unit four, castle. castle. build castles in the air. build castles in the air. input, input, input. input, input, input capacity, capacity. analyze. analyze . massive. massive . network. network . coin corn, breakthrough. breakthrough . finance. finance. to name but a few. the name but a few. Autonomous domestic, domestic . thain . threaten . commit . commit crime, crime. murder. murder. ge orge pose. pose. apparently. apparently. warning. warning. demand. demand victim, victim . four, victim two. fall victim, too . greedy. greedy recognition, recognition . database. database. alternative. alternative . hacker. hacker theft, theft. break into. break into. feel safe. feel safe. drone . drown distribution, distribution. predict. predict. decrease, decrease. decrease, decrease. deny. deny quantity, quantity in large . quantities. in large quantities . airline. airline. treat . threat. spy. spy. spy on. spy on illegal, illegal . monitor. monitor license, license stadium, stadium. highlight. highlight. capsule. capsule. Barry. barry. fountain. fountain. fountain pen. fountain pen. contemporary, contemporary seed. seed. wait. wait. muscular. muscular. conclude. conclude. justified. justified. superiority. superiority. virtual. virtual. at the forefront of. at the forefront of . definition. definition. headset. headset. sensor. sensor. practical. practical, a host of, a host of . academic. academic. immersive. immersive . engine. engage. twin. twin. clone. clone. barrier. barrier. boil down to. boil down . to fine tune. fine tune. initial. initial. optimistic. optimistic. noy . annoy weed, weed . like weeds. like weeds. State of the art. state of the art. globe. globe. satellite. satellite . expense, expense at the expensive. at the expense . of gender. gender . envy. envy. pub. pub.