J P J J J PB aaP J J J J J J aPP PPP aaap J .aPP aPPP PPPP aa --aa F J PI El aaa aaa -Uaaa --aaaa -J J--* It is of course possible for a line to be formed by the incidence of more than three volumes and a point by more than four; however this normally requires a high degree of order (as in a uniform stack of uniform cubes, for example) and is not normally encountered in microstructures.
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