; Flatline example: classify loan applicants
; based on age and income fields
(let (age    (f "age")
      income (f "annual_income")
      debt   (f "debt_ratio"))
  (cond
    (< age 18)               "underage"
    (> debt 0.5)             "high_debt"
    (and (>= age 25)
         (> income 50000))   "qualified"
    true                     "review"))