1type t = string list 2 3let make s = [s] 4 5let to_string t = String.concat " " t 6 7let empty = [] 8 9let combine t1 t2 = t1 @ t2 10 11let concat ts = List.concat ts 12 13let ( @+ ) = combine 14 15let is_empty = function 16 | [] -> true 17 | _ -> false 18 19let of_strings ss = ss
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