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# coding=utf-8
id = 173
number = 82
visible = False
facts = 'denotational_semantics_aux__predicates'
solution = '''\
prog_8puzzle(R0 --> R) -->
[begin],
{ findblank(R0,C0) },
instructs173(((R0,C0) --> (R,_C))),
[end].
instructs173((R0,C0) --> (R,C)) -->
instr173((R0,C0) --> (R,C)).
instructs173((R0,C0) --> (R,C)) -->
instr173((R0,C0) --> (R1,C1)), instructs173((R1,C1) --> (R,C)).
instr173((R0,C0) --> (R,C)) -->
[left], {Pos is (C0-1) mod 3,
(Pos>0, C is C0-1, swap(R0,C0,C,R)
;
Pos=0, C=C0, R=R0)}.
instr173((R0,C0) --> (R,C)) -->
[right], {Pos is (C0-1) mod 3,
(Pos<2, C is C0+1, swap(R0,C0,C,R)
;
Pos=2, C=C0, R=R0)}.
instr173((R0,C0) --> (R,C)) -->
[up], { (C0>3, C is C0-3, swap(R0,C0,C,R)
;
C0=<3, C=C0, R=R0)}.
instr173((R0,C0) --> (R,C)) -->
[down], { (C0=<6, C is C0+3, swap(R0,C0,C,R)
;
C0>6, C=C0, R=R0)}.
'''
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