{HEAD ~ The relative winding polarities} of the upper primary winding L2, lower primary winding L1 and secondary winding Ls are indicated in {TAIL ~ a conventional manner} by the dots  
are indicated in
{ HEAD ~ The relative winding polarities } of the upper primary winding L2 , lower primary winding L1 and secondary winding Ls are indicated in { TAIL ~ a conventional manner } by the dots
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH