The design option routine can be further expanded by having {TAIL ~ the operator} select {HEAD ~ more menu selections} 
The design option routine can be further expanded by having { TAIL ~ the operator } select { HEAD ~ more menu selections }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD