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atimura fujiwarai convergent photographs definite point Didymocarpus nanophyton dorsal oesophageal trunk genus Eunectes hederaceus hernia of mediastinum Howe truss index number of invariable construction jamming plank of deck method by inversion multistar topology normal carryover Peucedanum violaceum Royal Ballet self- correcting spondylolysis torpedo boat urban heating system