A storage space is defined by {TAIL ~ a wall} which in {HEAD ~ its lower portion} is provided with an inclined surface, which protrudes into the storage space 
A storage space is defined by { TAIL ~ a wall } which in { HEAD ~ its lower portion } is provided with an inclined surface , which protrudes into the storage space
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH