(ordered by popularity)
foreign
free
international
social
cultural
ion
mutual
economic
direct
reciprocal
fair
brief
unequal
gaseous
rapid
verbal
commercial
nuclear
respiratory
voluntary
constant
genetic
key
intellectual
heated
continuous
regular
adequate
pulmonary
symbolic
monetary
lively
electronic
net
informal
way
automatic
equal
scarce
ceremonial
efficient
heat
forward
isotopic
interpersonal
sharp
friendly
frank
regional
frequent
quick
conversational
indirect
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