| http://www.w3.org/ns/prov#value | - FIG. 3B is a side view of the second preferred embodiment 300 of FIG. 3A along arrow B. Embodiment 300 includes PVC pipes 310, 320, 330, 340 connected in a rectangular pattern to one another by being inserted into the open ends of ninety degree bend couplers 315, 325, 335 and 345.
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