{HEAD ~ A broad space} is formed between {TAIL ~ the rib} and a back plate portion of the groove so as to interrupt the flow of rain water running toward the interior of building frame 
is formed between
{ HEAD ~ A broad space } is formed between { TAIL ~ the rib } and a back plate portion of the groove so as to interrupt the flow of rain water running toward the interior of building frame
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 OTH OTH OTH OTH OTH OTH OTH OTH