The two longer sides constitute a pair of straight parallel primary locating sides while the four shorter sides constitute pairs of {HEAD ~ secondary locating sides} extending at obtuse angles from {TAIL ~ each end} of each primary locating side 
extending from
The two longer sides constitute a pair of straight parallel primary locating sides while the four shorter sides constitute pairs of { HEAD ~ secondary locating sides } extending at obtuse angles from { TAIL ~ each end } of each primary locating side
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH