What gas is needed for burning?

or:What gas is needed for burning?or:Well a lot of gasses can burn, here you've got a full list of them http://www.engineeringtoolbox.com/explosive-c

or:What gas is needed for burning?

or:Well a lot of gasses can burn, here you've got a full list of them http://www.engineeringtoolbox.com/explosive-concentration-limits-d_423.html

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