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A previous ALMA study of submillimetre galaxies in the Extended Chandra Deep Field South determined the redshift of this optically and near-infrared undetected source through the measurement of [CII] 157.74 $\\mu$m emission. Using the luminosity of the $^{12}$CO(2-1) emission we estimate the gas mass to be $M_{\\rm gas} \\sim 1.7 \\times 10^{10}$ ${\\rm M}_\\odot$. 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