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Alternatively, if you wanted to roll before choosing a class:
1. Roll Str, Dex, Int, Wis, Cha in order, 4d6 drop lowest, treating any roll below 8 as 8 and any roll of 16-18 as 16
2. If none of these 5 rolls is higher than 14, replace your highest rolled stat with a 16(if there is a tie...