The union of two tables is basically the total of the two tables, so "or" questions would be my guess.
Answer: These are all the computers they use All.
All In One Computers.
Medical Grade Computers.
Medical Tablets.
Medical Box PCs.
Medical Box PCs.
Displays & Monitors.
Medical Grade Monitors.
Because the string is invalid or your source is not attached to your search engine.
Answer:
easy to grow crops should be the answer