gas@@1	gas	vapor	10
gas@@1	gas	fume	9
gas@@1	gas	volatile substance	7
gas@@1	gas	fuel	6
gas@@1	gas	methane	5
gas@@1	gas	propane	5
gas@@1	gas	gaseous fuel	3
gas@@1	gas	gaseous substance	3
gas@@2	gas	fuel	13
gas@@2	gas	petrol	8
gas@@2	gas	gasoline	7
gas@@2	gas	fume	5
gas@@2	gas	vapor	5
gas@@2	gas	volatile substance	5