user=> (ffirst '([])) nil user=> (ffirst ['(a b c) '(b a c)]) a user=> (ffirst '([a b c] [b a c])) a
user=> (ffirst '([])) nil user=> (ffirst ['(a b c) '(b a c)]) a user=> (ffirst '([a b c] [b a c])) a
user=> (ffirst '([])) nil user=> (ffirst ['(a b c) '(b a c)]) a user=> (ffirst '([a b c] [b a c])) a
user=> (ffirst ['(a b c) '(b a c)]) a user=> (ffirst '([a b c] [b a c])) a