Solving 3.13, 3.14 and 3.15 - plus fixes which led to solving 3.13 (check out fold left and comment that follows - (f acc x)) :)
Solving 3.13, 3.14 and 3.15 - plus fixes which led to solving 3.13
(check out fold left and comment that follows - (f acc x)) :)

rssole/clojureplayground,rssole/clojureplayground