{TAIL ~ The above embodiment} has described the use of the vapor produced in the final evaporation stage, but also vapor generated in other evaporation stages may be used, if {HEAD ~ the properties} of the vapor are suitable for the purpose 
{ TAIL ~ The above embodiment } has described the use of the vapor produced in the final evaporation stage , but also vapor generated in other evaporation stages may be used , if { HEAD ~ the properties } of the vapor are suitable for the purpose
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