(deftemplate student "Атрибуты студента"
  (slot name)        ; имя студента
  (slot age)         ; возраст
  (slot year)        ; год обучения (курс)
  (slot spec)        ; специализация
  (slot aver_mark))  ; средний балл

(deffacts students "База данных студентов"
  (student (name John) (age 20) (year 3) (spec "hard") (aver_mark 4.5))
  (student (name Jane) (age 18) (year 2) (spec "hard") (aver_mark 5.0))
  (student (name Jude) (age 22) (year 4) (spec "soft") (aver_mark 3.8))
  (student (name Toma) (age 21) (year 3) (spec "ai")   (aver_mark 3.5))
  (student (name Joan) (age 19) (year 4) (spec "hard") (aver_mark 4.5))
  (student (name Mark) (age 23) (year 5) (spec "soft") (aver_mark 3.0))
  (student (name Fred) (age 20) (year 2) (spec "ai")   (aver_mark 4.0))
  (student (name Eric) (age 24) (year 6) (spec "hard") (aver_mark 4.5))
  (student (name Mary) (age 20) (year 3) (spec "ai")   (aver_mark 3.6))
  (student (name Beth) (age 24) (year 5) (spec "soft") (aver_mark 3.1))
)

(defrule find-student "Задание 1"
  ;...
)