{HEAD ~ Devices} are provided for introducing separately reactants to within the tubes of the reactor and coolant to the channels defined between {TAIL ~ adjacent tubes} of the bundle 
{ HEAD ~ Devices } are provided for introducing separately reactants to within the tubes of the reactor and coolant to the channels defined between { TAIL ~ adjacent tubes } of the bundle
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH