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We use the wall-crossing setup developed by the author and Joyce in Joyce's Lie algebra $H_*(\\N^{\\pl},\\Q)$ of the projective-linear pairs stack, and next pass to Gross's polynomial realization $e^{\\kappa}\\Q[s_{jk\\ell}]$.\n  We compute explicit examples of one-dimensional Donaldson--Thomas invariants on Fano 3-folds and, via wall-crossing, Pandharipande--Thomas stable pair invariants and descendent generating series. 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