An ice skateboard 1 where the top surface of the ice skateboard had {HEAD ~ a surface} which is {TAIL ~ a skid resistant surface} 
is
An ice skateboard 1 where the top surface of the ice skateboard had { HEAD ~ a surface } which is { TAIL ~ a skid resistant surface }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL