gas - water
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gas - water
water - land
land - sky
sky - sea...
sea - terra firma
terra firma - ocean
ocean - continent
continent - country
country - big city
big city - village
village - hermit
hermit - crowd
crowd - solo
solo - duet
duet - uncouple
uncouple - join
join - resign
resign - commence
commence - stop
stop - go...
go - remain
remain - leave
leave - arrive
arrive - depart
depart - stay
stay - travel
travel - halt
halt - start
start - end
end - beginning
beginning - conclusion
conclusion - opening
opening - closing
closing - commence
commence - terminate
terminate = begin
begin - finish
finish - start .........
start - halt
halt - proceed