(seq [i :range [0 3] j :range [0 3] :let [c (string/format "%c" (+ 97 i))]] [(keyword c) j]) # => '@[(:a 0) (:a 1) (:a 2) (:b 0) (:b 1) (:b 2) (:c 0) (:c 1) (:c 2)]