{HEAD ~ Both laser scanning apparatuses} are {TAIL ~ multi beam scanning apparatuses} which form an image on a scanned surface, i.e., the surface of photosensitive member 7, via a plurality of laser beams 2 
are
{ HEAD ~ Both laser scanning apparatuses } are { TAIL ~ multi beam scanning apparatuses } which form an image on a scanned surface , i.e. , the surface of photosensitive member 7 , via a plurality of laser beams 2
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH