ref: 2c166a1496c5638924d29df9dcf6c125a31ce18c
dir: /example.pl/
math(A,B,C,D) :- D is A + B + C * A. parentest :- 1 + 2 * 3 + 4. parentest :- (0 * (1 + 2) * 3) * 3 + 4. likes(bob, ice). likes(sam, text). likes(sam, ice). could_be_friends(Person1, Person2) :- likes(Person1, Thing1), likes(Person2, Thing2), Thing1 = Thing2. list1(A) :- A = [1,2,3,4]. list2(A) :- A = [a,b|c]. curly(A) :- A = {one,two,three}. tester(A, B) :- !, A = B. tester(A, B) :- true.