However, the horizontal gas flow flows far above from the tip of the core burner flame, so that it is possible to raise the height of the core partition to the extent such that the core partition does not prevent {HEAD ~ the flow} of {TAIL ~ the horizontal gas} 
of
However , the horizontal gas flow flows far above from the tip of the core burner flame , so that it is possible to raise the height of the core partition to the extent such that the core partition does not prevent { HEAD ~ the flow } of { TAIL ~ the horizontal gas }
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