The top surface 30 may include {TAIL ~ a first step} 44 that extends from {HEAD ~ the top surface} 30 
The top surface 30 may include { TAIL ~ a first step } 44 that extends from { HEAD ~ the top surface } 30
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH