{TAIL ~ The bus} also enables the execution of {HEAD ~ I/O operations} that originated in external controllers and transmitted over the communication network 
{ TAIL ~ The bus } also enables the execution of { HEAD ~ I / O operations } that originated in external controllers and transmitted over the communication network
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH