The pattern of the large cells identifies orientation while the exact shape of the large cell will be {TAIL ~ an indicator} of {HEAD ~ skew} 
The pattern of the large cells identifies orientation while the exact shape of the large cell will be { TAIL ~ an indicator } of { HEAD ~ skew }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD