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Ecodices csg max. Chapter XXI De metro iambico tetametro of the Venerable Bede's De Arte Metrica in manuscript from the monastery of St Gallen Cod Sang The text starts Metrum iambicum tetrametrum recipit iambum locis omnibus spondeum tantum locis imparibus Quo scriptus est hymnus Sedulii solis ortus cardine Ad usque terrae limitem