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ballast compactor commutative system D antiscorbutic factor dance flies dolomite mountains Farr's technic flue-dust retainer Germiool Hevelius Johannes integrating ammeter iterative fulfilment of boundary condition lycaeopsis zamboanmgae naphthoresorcinol reagent Nigan pantograph dividing machine Samae San Ko speed log triple-expansion engine twin bunkbed Wittig reaction