prolog

The below prolog program is given. a. What is the output of likes(X,Y). b. What is the output of isHappy(k). has(joy, laptop). has(jemmy, ps2). has(azrai, iphone6). has(encikSuka, ferrari). has(encikMulia, ferrari). has(pen, ferrari). plays(jemmy, volleyball). plays(jamal, volleyballl). plays(joy, volleyball). plays(jemmy, badminton). plays(joy, badminton). non_smoker(ali). non_smoker(jemmy). non_smoker(azrai). non_smoker(chan). non-smoker(joy). nice(pen). nice(jeff). like_travel(pen). like_travel(zain). likes(joy, Y) :- plays(Y, volleyball), plays (Y, badminton), has(Y,ps2), non_smoker(Y). isHappy(x) :- nice(X), like_travel(x), has(x, ferrari)