(test (between 3 5))
(test {3 4 5})

(test (min&max {10 20 4 40 23}))
(test [4 40])

(test (fib 10))
(test 89)

(test (fact 10))
(test 3628800)

(test (gcd {10 20 40 35}))
(test 5)