{TAIL ~ a USB host} providing {HEAD ~ a USB VBUS power signal} compliant with USB VBUS power signal requirements 
{ TAIL ~ a USB host } providing { HEAD ~ a USB VBUS power signal } compliant with USB VBUS power signal requirements
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH