first and second side portions integral with {HEAD ~ each slotted portion} at {TAIL ~ one side edge} of said slotted portions 
at
first and second side portions integral with { HEAD ~ each slotted portion } at { TAIL ~ one side edge } of said slotted portions
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH