go =>
  N = 10,

  % "direct" test that will fail if not satisfied
  N < 14,

  % if/then/elseif/else
  if N < 14 then
    println("less than 14")
  elseif N == 14 then
    println("is 14")
  else
    println("not less than 14")
  end,

  % From Prolog: (condition -> then ; else)
  ( N < 14 ->
   println("less than 14")
   ;
   println("not less than 14")
  ),

  % Ret = cond(condition, then, else)
  println(cond(N < 14, "less than 14", "not less than 14")),

  % as a predicate
  test_pred(N),

  % as condition in a function's head
  println(test_func(N)),

  println(ok), % all tests are ok

  nl.

% as a predicate
test_pred(N) ?=>
  N < 14,
  println("less than 14").
test_pred(N) =>
  N >= 14,
  println("not less than 14").

% condition in function head
test_func(N) = "less than 14", N < 14 => true.
test_func(_N) = "not less than 14" => true.