difficult
freeze
easy
enemy
friend
vanish
appear
solids
quit
scatter
begin
danger
safety
liquids
gather
exit
help
thick
silent
prevent
enter
noisy
die
thin
start
live
stop
reject
accept
general
center
urban
rural
respect
support
specific
edge
oppose
contempt
waste
save
correct
false
resist
surrender
collect
distribute
seek
avoid
simple
complex
a
melt
a