TPTP Problem File: PLA002-1.p

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```%--------------------------------------------------------------------------
% File     : PLA002-1 : TPTP v7.3.0. Released v1.0.0.
% Domain   : Planning
% Problem  : Getting from here to there, in all weather
% Version  : Especial.
% English  : The problem is to travel from one place to another.
%            Certain paths are passable at different times of the year, so
%            a conditional plan must be generated. Either all situations
%            are cold or all situations are warm. There is a river which
%            may be crossed only in winter when it is covered with ice,
%            and a mountain range may be crossed only in summer. The
%            problem is to get from city F to city A.

% Refs     : [Pla82] Plaisted (1982), A Simplified Problem Reduction Format
% Source   : [Pla82]
% Names    : Problem 5.7 [Pla82]

% Status   : Unsatisfiable
% Rating   : 0.00 v6.3.0, 0.14 v6.2.0, 0.00 v5.0.0, 0.07 v4.1.0, 0.00 v2.0.0
% Syntax   : Number of clauses     :   17 (   1 non-Horn;   2 unit;  16 RR)
%            Number of atoms       :   36 (   0 equality)
%            Maximal clause size   :    3 (   2 average)
%            Number of predicates  :    3 (   0 propositional; 1-2 arity)
%            Number of functors    :   12 (   7 constant; 0-2 arity)
%            Number of variables   :   17 (   3 singleton)
%            Maximal term depth    :    2 (   1 average)
% SPC      : CNF_UNS_RFO_NEQ_NHN

% Comments :
%--------------------------------------------------------------------------
cnf(warm_or_cold,hypothesis,
( warm(Situation1)
| cold(Situation2) )).

cnf(walk_a_to_b,hypothesis,
( ~ at(a,Situation)
| at(b,walk(b,Situation)) )).

cnf(drive_a_to_b,hypothesis,
( ~ at(a,Situation)
| at(b,drive(b,Situation)) )).

cnf(walk_b_to_a,hypothesis,
( ~ at(b,Situation)
| at(a,walk(a,Situation)) )).

cnf(drive_b_to_a,hypothesis,
( ~ at(b,Situation)
| at(a,drive(a,Situation)) )).

cnf(cross_river_b_to_c,hypothesis,
( ~ cold(Situation)
| ~ at(b,Situation)
| at(c,skate(c,Situation)) )).

cnf(cross_river_c_to_b,hypothesis,
( ~ cold(Situation)
| ~ at(c,Situation)
| at(b,skate(b,Situation)) )).

cnf(climb_mountain_b_to_d,hypothesis,
( ~ warm(Situation)
| ~ at(b,Situation)
| at(d,climb(d,Situation)) )).

cnf(climb_mountain_d_to_b,hypothesis,
( ~ warm(Situation)
| ~ at(d,Situation)
| at(b,climb(b,Situation)) )).

cnf(go_c_to_d,hypothesis,
( ~ at(c,Situation)
| at(d,go(d,Situation)) )).

cnf(go_d_to_c,hypothesis,
( ~ at(d,Situation)
| at(c,go(c,Situation)) )).

cnf(go_c_to_e,hypothesis,
( ~ at(c,Situation)
| at(e,go(e,Situation)) )).

cnf(go_e_to_c,hypothesis,
( ~ at(e,Situation)
| at(c,go(c,Situation)) )).

cnf(go_d_to_f,hypothesis,
( ~ at(d,Situation)
| at(f,go(f,Situation)) )).

cnf(go_f_to_d,hypothesis,
( ~ at(f,Situation)
| at(d,go(d,Situation)) )).

cnf(initial,hypothesis,
( at(f,s0) )).

cnf(prove_you_can_get_to_a,negated_conjecture,
( ~ at(a,S) )).

%--------------------------------------------------------------------------
```