{HEAD ~ The tubing} 50 is provided with downwardly directed apertures 51 at {TAIL ~ intervals} along its length to obtain the spray 52 into the corner at which the walls and the floor meet 
{ HEAD ~ The tubing } 50 is provided with downwardly directed apertures 51 at { TAIL ~ intervals } along its length to obtain the spray 52 into the corner at which the walls and the floor meet
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH