steam@@1	steam	vapor	5
steam@@1	steam	air	2
steam@@2	steam	steam power	7
steam@@2	steam	steam-driven	7
steam@@2	steam	steam-powered	7
steam@@2	steam	vapor	5
steam@@2	steam	heated vapor	4
steam@@2	steam	steam-engine	4
steam@@2	steam	water	4
steam@@2	steam	water vapor	2