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The eighteen teams joined the preliminary round, played as mini-tournaments with three teams in each group, where only the first qualified team advanced to further stages.[1]
The winners of groups A, B, C and D joined the intermediate stage while the winners of the groups E and F directly qualified for the semifinals.
The first leg was played on 31 January 2018, while the second leg of the series between Valencian Community and Galicia was played on 14 February and the one between Castile and León and Catalonia, on 28 February.