intercalate -bytestring

intercalate :: [a] -> [[a]] -> [a]
base Data.List
intercalate xs xss is equivalent to (concat (intersperse xs xss)). It inserts the list xs in between the lists in xss and concatenates the result.
intercalate :: Text -> [Text] -> Text
text Data.Text, text Data.Text.Lazy
O(n) The intercalate function takes a Text and a list of Texts and concatenates the list after interspersing the first argument between each element of the list.