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However, so far no conclusive observation of such objects has been made.\n  Aims. We aim to study the very early stages of high-mass star formation in two infrared-dark, massive clumps, to identify the core population that they harbour.\n  Methods. We obtained ALMA observations of continuum emission at 0.8mm and of the ortho-$\\rm H_2D^+$ transition at 372GHz towards the two clumps. 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