SRL for [justified]: Since the hazards of poor communication are so great , can be [justified] as a habitable site only on the basis of unusual productivity such as is made available by a waterfall for milling purposes , a mine , or a sugar maple camp .
ARG-M-CAU: Since the hazards of poor communication are so great | ARG-M-MOD: can | ARG-3: as a habitable site | ARG-2: only on the basis of unusual productivity such as is made available by a waterfall for milling purposes , a mine , or a sugar maple camp