{HEAD ~ The propped block} 31 further has {TAIL ~ a slope} 311 formed between the propped surfaces 312, and 313 
has
{ HEAD ~ The propped block } 31 further has { TAIL ~ a slope } 311 formed between the propped surfaces 312 , and 313
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH