| http://www.w3.org/ns/prov#value | - a tray for storing and separately maintaining a plurality of chemicals, the tray including: a plurality of receptacles arranged in at least two series, the at least two series including a first series and a second series, wherein each receptacle has a floor, and at least part of the floor in each receptacle in the first series is tapered toward the second series; the receptacles in each series bei
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