(ordered by popularity)
natural
valuable
important
only
last
human
scarce
excellent
major
renewable
invaluable
useful
common
national
limited
economic
precious
single
rich
particular
primary
vital
key
greatest
critical
available
main
best
shared
essential
basic
potential
chief
additional
powerful
significant
unique
cultural
sole
principal
strategic
financial
comprehensive
educational
online
finite
untapped
nonrenewable
abundant
indispensable
vast
ultimate
crucial
wonderful
productive
exhaustible
environmental
helpful
tremendous
inexhaustible
infinite
ready
electronic
global
prime
expensive
recreational
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