Structures 12 and 13 of {HEAD ~ each wall section} 35 are typically molded as {TAIL ~ one unit}, i.e., are interconnected 
Structures 12 and 13 of { HEAD ~ each wall section } 35 are typically molded as { TAIL ~ one unit } , i.e. , are interconnected
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH