How many literals (including negations) exist at the second state level

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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Q2 Consider using GraphPlan to solve the following planning domain and problem:

(define (domain domain-d)
(:requirements :strips)
(:predicates
(prop ?a)
)

(:action act1
:parameters (?a)
:precondition (not (prop ?a))
:effect (prop ?a)
)
)

 


(define (problem problem-d)
(:domain domain-d)
(:objects
x
y
)
(:init
)
(:goal (and (prop x) (prop y)))
)

How many literals (including negations) exist at the second state level? 

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