At least one of {HEAD ~ the one or more sources} of {TAIL ~ a sanitizing agent} may be a source of germicidal ultraviolet light 
of
At least one of { HEAD ~ the one or more sources } of { TAIL ~ a sanitizing agent } may be a source of germicidal ultraviolet light
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH