 Complete the following phrase:  One of the Finnish Navys traditions has been to name its major combat ships after regions in Finland. The name Pohjanmaa, which is the Finnish name for the region Ostrobothnia, has been used both by the Finnish and Swedish navies for previous ships and classes of ships, dating back to the 18th century with the first recorded vessel being Gamla Pojama Old Pohjanmaa, that was launched in 1760, and the last one, being the minelayertraining vessel , which was sold in 2016. The aforementioned 18th century Pohjanmaa, alongside the Hämeenmaa, Uusimaa and Turunmaa types were also the four main archipelago frigate types used in the 1790 