| http://www.w3.org/ns/prov#value | - Although cup-shaped filters having circular cross-sections are shown in FIGS. 7, 34, 35, 58, 59, 60, 61, 62 and 63, cup-shaped filters having other cross-sectional shapes such as oval, triangular, square, rectangular, pentagonal, hexagonal, octagonal, etc. may also be nested in each other.
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