In the case that the sound processor is connected to a plurality of common buses, the bus interface means is also required for {TAIL ~ each} of {HEAD ~ the common buses} 
In the case that the sound processor is connected to a plurality of common buses , the bus interface means is also required for { TAIL ~ each } of { HEAD ~ the common buses }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD