Not so fast! There is a fifth base! One that I like to call GEOCACHINE.
If present, traits such as perseverance, puzzle solving, curiosity, obstinacy, and a predilection for technological devices are usually dominant. These may manifest as a desire to examine surroundings in minute detail (moving rocks and logs; lifting lampskirts; poking into hedgerows), a sudden urge to plunge through thickets and thorns without regard to personal comfort (or thought of searching for a nearby path), and a desire to surround oneself with GPS enabled devices at all times.
In short, Geocaching is in our Genes!
Additional info for Genetically Modified SET
The set includes the four regular edition coins plus the XLE black nickel edition coin. The XLE is only available as part of this set and only 20 will be made.