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Provides reusable row-bound design\nspecifications and explicit conditional term blocks, named\nlinear restrictions, explicit predictor-grid contrasts, and\nfixed or reevaluated basis recipes under a homogeneous\nisotropic measurement-fluctuation assumption. Supports explicit\nknown-reference mean hypotheses and paired differences from\nparallel measurement pairs. Encodes fixed person-by-occasion\nmodels with parallel indicators, implicit person adjustment and\nwhole-person bootstrap with distinct sampled copies. 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