In {TAIL ~ some cases}, different setting values associated with {HEAD ~ the same setting} may be summed to achieve the final setting value 
In { TAIL ~ some cases } , different setting values associated with { HEAD ~ the same setting } may be summed to achieve the final setting value
OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH