(ordered by popularity)
major
important
main
only
primary
light
single
common
principal
chief
potential
constant
original
possible
sole
best
rich
ultimate
current
external
valuable
reliable
excellent
significant
additional
open
true
largest
fruitful
third
useful
sound
alternative
greatest
prime
likely
outside
independent
secondary
immediate
available
inexhaustible
divine
obvious
frequent
ray
authoritative
invaluable
powerful
fertile
convenient
unknown
dominant
probable
prolific
ideal
vital
continuous
ready
potent
unexpected
abundant
steady
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