{HEAD ~ The second member} is removable from {TAIL ~ the channels} by pulling the second member away from the channels to disengage the flanges from the channels 
is removable from
{ HEAD ~ The second member } is removable from { TAIL ~ the channels } by pulling the second member away from the channels to disengage the flanges from the channels
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH