said {HEAD ~ slot elements} including {TAIL ~ respective guide walls} disposed in parallel opposition to said port member and slidably engaged by the corresponding tongue elements, 
including
said { HEAD ~ slot elements } including { TAIL ~ respective guide walls } disposed in parallel opposition to said port member and slidably engaged by the corresponding tongue elements ,
OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH