2+2=4
It is no accident that a fourlegged table is more stable than a three legged table. Patterns and combinations containing four elements are very common in both natural and human culture. Take for example....
gravity
adenine
solid
earth
length
hydrogen
blue
strong nuclear
thiamine
plasma
fire
time
carbon
tone
weak nuclear
cytosine
gas
air
depth
oxygen
yellow
electormagnetism
guanine
liquid
water
width
nitrogen
red
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