{HEAD ~ The sleeves} may be biased into an open or {TAIL ~ a substantially flattened configuration} 
biased into
{ HEAD ~ The sleeves } may be biased into an open or { TAIL ~ a substantially flattened configuration }
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL