The inner wall member includes a transverse bottomplate which is provided with {HEAD ~ a series} of openings around {TAIL ~ its periphery} 
The inner wall member includes a transverse bottomplate which is provided with { HEAD ~ a series } of openings around { TAIL ~ its periphery }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL