The method includes providing {HEAD ~ a reactor} that comprises {TAIL ~ at least a first multicellular extruded body} oriented with its cells extending in parallel in a vertically downward direction from a first end of the body to a second end 
The method includes providing { HEAD ~ a reactor } that comprises { TAIL ~ at least a first multicellular extruded body } oriented with its cells extending in parallel in a vertically downward direction from a first end of the body to a second end
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH