{TAIL ~ The propped block} has {HEAD ~ several horizontal propped surfaces} on the bottom, which are formed at different heights with slopes formed in between 
{ TAIL ~ The propped block } has { HEAD ~ several horizontal propped surfaces } on the bottom , which are formed at different heights with slopes formed in between
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH