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