{HEAD ~ a plurality} of {TAIL ~ anchor plates} arranged in a longitudinal direction, each of said anchor plates being secured to the bottom of a tank; and 
{ HEAD ~ a plurality } of { TAIL ~ anchor plates } arranged in a longitudinal direction , each of said anchor plates being secured to the bottom of a tank ; and
HEAD HEAD HEAD HEAD HEAD HEAD REL 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