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We present expressions for shape variables of B decay distributions in several different mass schemes, to order ${\ensuremath{\alpha}}_{s}^{2}{\ensuremath{\beta}}_{0}$ and ${\ensuremath{\Lambda}}_{\mathrm{QCD}}^{3}{/m}_{b}^{3}.$ Such observables are sensitive to the b quark mass and matrix elements in the heavy quark effective theory, and recent measurements allow precision determinations of some of these parameters. We …