c(1,4). c(2,1). c(2,3). c(2,6). c(3,5). c(5,4). r(X,X). r(X,Y) :- c(Z,Y), r(X,Z). What would Prolog return if given the following queries? (Report all the answers returned, in the order Prolog would return them.) ?- r(2,4).  2. ?- r(W,4).

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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  1. Consider a section of a Prolog program below.

c(1,4).

c(2,1).

c(2,3).

c(2,6).

c(3,5).

c(5,4).

r(X,X).

r(X,Y) :- c(Z,Y), r(X,Z).

What would Prolog return if given the following queries? (Report all the answers returned, in the order Prolog would return them.)

  1. ?- r(2,4). 

2. ?- r(W,4).

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