MAYBE
(ignored inputs)COMMENT the following rules are removed from the original TRS b ( b ( x ) ) -> b ( b ( x ) ) b ( a ( x ) ) -> b ( a ( x ) )
Rewrite Rules:
   [ b(b(?x)) -> a(b(?x)),
     c(a(?x)) -> c(c(?x)),
     b(c(?x)) -> c(c(?x)),
     b(a(?x)) -> b(b(?x)),
     c(b(?x)) -> c(a(?x)),
     c(c(?x)) -> b(a(?x)) ]
Apply Direct Methods...
Inner CPs:
   [ b(c(c(?x_2))) = a(b(c(?x_2))),
     b(b(b(?x_3))) = a(b(a(?x_3))),
     b(c(c(?x_1))) = c(c(a(?x_1))),
     b(c(a(?x_4))) = c(c(b(?x_4))),
     b(b(a(?x_5))) = c(c(c(?x_5))),
     c(a(b(?x))) = c(a(b(?x))),
     c(c(c(?x_2))) = c(a(c(?x_2))),
     c(b(b(?x_3))) = c(a(a(?x_3))),
     c(c(c(?x_1))) = b(a(a(?x_1))),
     c(c(a(?x_4))) = b(a(b(?x_4))),
     b(a(b(?x))) = a(b(b(?x))),
     c(b(a(?x))) = b(a(c(?x))) ]
Outer CPs:
   [  ]
not Overlay, check Termination...
unknown/not Terminating
unknown Knuth & Bendix
Linear
unknown Development Closed
unknown Strongly Closed
unknown Weakly-Non-Overlapping & Non-Collapsing & Shallow
inner CP cond (upside-parallel)
innter CP Cond (outside)
unknown Upside-Parallel-Closed/Outside-Closed
(inner) Parallel CPs: (not computed)
unknown Toyama (Parallel CPs)
Simultaneous CPs:
   [ b(a(b(?x_1))) = a(b(b(?x_1))),
     b(c(c(?x_3))) = a(b(c(?x_3))),
     b(b(b(?x_4))) = a(b(a(?x_4))),
     a(b(a(b(?x_1)))) = b(a(b(b(?x_1)))),
     a(b(c(c(?x_3)))) = b(a(b(c(?x_3)))),
     a(b(b(b(?x_4)))) = b(a(b(a(?x_4)))),
     c(a(a(b(?x_1)))) = c(a(b(b(?x_1)))),
     c(a(c(c(?x_3)))) = c(a(b(c(?x_3)))),
     c(a(b(b(?x_4)))) = c(a(b(a(?x_4)))),
     a(b(b(?x))) = b(a(b(?x))),
     c(a(b(?x))) = c(a(b(?x))),
     c(c(a(?x))) = b(c(c(?x))),
     b(a(a(?x))) = c(c(c(?x))),
     b(c(c(?x_3))) = c(c(a(?x_3))),
     b(c(a(?x_5))) = c(c(b(?x_5))),
     b(b(a(?x_6))) = c(c(c(?x_6))),
     a(b(c(c(?x_3)))) = b(c(c(a(?x_3)))),
     a(b(c(a(?x_5)))) = b(c(c(b(?x_5)))),
     a(b(b(a(?x_6)))) = b(c(c(c(?x_6)))),
     c(a(c(c(?x_3)))) = c(c(c(a(?x_3)))),
     c(a(c(a(?x_5)))) = c(c(c(b(?x_5)))),
     c(a(b(a(?x_6)))) = c(c(c(c(?x_6)))),
     a(b(c(?x))) = b(c(c(?x))),
     c(a(c(?x))) = c(c(c(?x))),
     a(b(a(?x))) = b(b(b(?x))),
     c(a(a(?x))) = c(b(b(?x))),
     c(c(c(?x_4))) = c(a(c(?x_4))),
     c(b(b(?x_5))) = c(a(a(?x_5))),
     c(c(a(b(?x_2)))) = b(c(a(b(?x_2)))),
     c(c(c(c(?x_4)))) = b(c(a(c(?x_4)))),
     c(c(b(b(?x_5)))) = b(c(a(a(?x_5)))),
     b(a(a(b(?x_2)))) = c(c(a(b(?x_2)))),
     b(a(c(c(?x_4)))) = c(c(a(c(?x_4)))),
     b(a(b(b(?x_5)))) = c(c(a(a(?x_5)))),
     c(c(b(?x))) = b(c(a(?x))),
     b(a(b(?x))) = c(c(a(?x))),
     c(b(a(?x_1))) = b(a(c(?x_1))),
     c(c(c(?x_3))) = b(a(a(?x_3))),
     c(c(a(?x_6))) = b(a(b(?x_6))),
     b(a(b(a(?x_1)))) = c(b(a(c(?x_1)))),
     b(a(c(c(?x_3)))) = c(b(a(a(?x_3)))),
     b(a(c(a(?x_6)))) = c(b(a(b(?x_6)))),
     c(c(b(a(?x_1)))) = b(b(a(c(?x_1)))),
     c(c(c(c(?x_3)))) = b(b(a(a(?x_3)))),
     c(c(c(a(?x_6)))) = b(b(a(b(?x_6)))),
     b(a(c(?x))) = c(b(a(?x))),
     c(c(c(?x))) = b(b(a(?x))) ]
unknown Okui (Simultaneous CPs)
unknown Strongly Depth-Preserving & Root-E-Closed/Non-E-Overlapping
unknown Strongly Weight-Preserving & Root-E-Closed/Non-E-Overlapping
check Locally Decreasing Diagrams by Rule Labelling...
Critical Pair <b(c(c(?x_2))), a(b(c(?x_2)))> by Rules <2, 0> preceded by [(b,1)]
 joinable by a reduction of rules <[([(b,1)],5),([],0)], [([(a,1)],2),([(a,1)],5)]>
Critical Pair <b(b(b(?x_3))), a(b(a(?x_3)))> by Rules <3, 0> preceded by [(b,1)]
 joinable by a reduction of rules <[([],0)], [([(a,1)],3)]>
Critical Pair <b(c(c(?x_1))), c(c(a(?x_1)))> by Rules <1, 2> preceded by [(b,1)]
 joinable by a reduction of rules <[([],2)], [([(c,1)],1)]>
Critical Pair <b(c(a(?x_4))), c(c(b(?x_4)))> by Rules <4, 2> preceded by [(b,1)]
 joinable by a reduction of rules <[([],2)], [([(c,1)],4)]>
Critical Pair <b(b(a(?x_5))), c(c(c(?x_5)))> by Rules <5, 2> preceded by [(b,1)]
 joinable by a reduction of rules <[], [([],5),([],3),([(b,1)],2),([(b,1)],5)]>
Critical Pair <c(a(b(?x))), c(a(b(?x)))> by Rules <0, 4> preceded by [(c,1)]
 joinable by a reduction of rules <[], []>
Critical Pair <c(c(c(?x_2))), c(a(c(?x_2)))> by Rules <2, 4> preceded by [(c,1)]
 joinable by a reduction of rules <[], [([],1)]>
Critical Pair <c(b(b(?x_3))), c(a(a(?x_3)))> by Rules <3, 4> preceded by [(c,1)]
 joinable by a reduction of rules <[([(c,1)],0),([],1),([(c,1)],4)], [([],1)]>
 joinable by a reduction of rules <[([],4),([],1),([(c,1)],4)], [([],1)]>
Critical Pair <c(c(c(?x_1))), b(a(a(?x_1)))> by Rules <1, 5> preceded by [(c,1)]
 joinable by a reduction of rules <[([(c,1)],5),([],4),([],1),([],5)], []>
 joinable by a reduction of rules <[([],5),([],3),([(b,1)],2),([(b,1)],5)], [([],3)]>
Critical Pair <c(c(a(?x_4))), b(a(b(?x_4)))> by Rules <4, 5> preceded by [(c,1)]
 joinable by a reduction of rules <[([],5),([],3),([(b,1)],3)], [([],3)]>
Critical Pair <b(a(b(?x))), a(b(b(?x)))> by Rules <0, 0> preceded by [(b,1)]
 joinable by a reduction of rules <[([],3),([],0)], []>
Critical Pair <c(b(a(?x))), b(a(c(?x)))> by Rules <5, 5> preceded by [(c,1)]
 joinable by a reduction of rules <[([],4),([],1),([(c,1)],1)], [([],3),([(b,1)],2),([],2)]>
unknown Diagram Decreasing
check Non-Confluence...
obtain 13 rules by 3 steps unfolding
obtain 100 candidates for checking non-joinability
check by TCAP-Approximation (failure)
check by Ordering(rpo), check by Tree-Automata Approximation (failure)
check by Interpretation(mod2) (failure)
check by Descendants-Approximation, check by Ordering(poly) (failure)
unknown Non-Confluence
unknown Huet (modulo AC)
check by Reduction-Preserving Completion...
failure(empty P)
unknown Reduction-Preserving Completion
check by Ordered Rewriting...
remove redundants rules and split
R-part:
   [ b(b(?x)) -> a(b(?x)),
     c(a(?x)) -> c(c(?x)),
     b(c(?x)) -> c(c(?x)),
     b(a(?x)) -> b(b(?x)),
     c(b(?x)) -> c(a(?x)),
     c(c(?x)) -> b(a(?x)) ]
E-part:
   [ ]
...failed to find a suitable LPO.
unknown Confluence by Ordered Rewriting
Direct Methods: Can't judge

Try Persistent Decomposition for...
   [ b(b(?x)) -> a(b(?x)),
     c(a(?x)) -> c(c(?x)),
     b(c(?x)) -> c(c(?x)),
     b(a(?x)) -> b(b(?x)),
     c(b(?x)) -> c(a(?x)),
     c(c(?x)) -> b(a(?x)) ]
Sort Assignment:
 a : 13=>13
 b : 13=>13
 c : 13=>13
maximal types: {13}
Persistent Decomposition failed: Can't judge

Try Layer Preserving Decomposition for...
   [ b(b(?x)) -> a(b(?x)),
     c(a(?x)) -> c(c(?x)),
     b(c(?x)) -> c(c(?x)),
     b(a(?x)) -> b(b(?x)),
     c(b(?x)) -> c(a(?x)),
     c(c(?x)) -> b(a(?x)) ]
Layer Preserving Decomposition failed: Can't judge

Try Commutative Decomposition for...
   [ b(b(?x)) -> a(b(?x)),
     c(a(?x)) -> c(c(?x)),
     b(c(?x)) -> c(c(?x)),
     b(a(?x)) -> b(b(?x)),
     c(b(?x)) -> c(a(?x)),
     c(c(?x)) -> b(a(?x)) ]
Inside Critical Pair: <b(c(c(?x_2))), a(b(c(?x_2)))> by Rules <2, 0>
develop reducts from lhs term...
<{2}, c(c(c(?x_2)))>
<{5}, b(b(a(?x_2)))>
<{}, b(c(c(?x_2)))>
develop reducts from rhs term...
<{2}, a(c(c(?x_2)))>
<{}, a(b(c(?x_2)))>
Inside Critical Pair: <b(b(b(?x_3))), a(b(a(?x_3)))> by Rules <3, 0>
develop reducts from lhs term...
<{0}, a(b(b(?x_3)))>
<{0}, b(a(b(?x_3)))>
<{}, b(b(b(?x_3)))>
develop reducts from rhs term...
<{3}, a(b(b(?x_3)))>
<{}, a(b(a(?x_3)))>
Inside Critical Pair: <b(c(c(?x_1))), c(c(a(?x_1)))> by Rules <1, 2>
develop reducts from lhs term...
<{2}, c(c(c(?x_1)))>
<{5}, b(b(a(?x_1)))>
<{}, b(c(c(?x_1)))>
develop reducts from rhs term...
<{5}, b(a(a(?x_1)))>
<{1}, c(c(c(?x_1)))>
<{}, c(c(a(?x_1)))>
Inside Critical Pair: <b(c(a(?x_4))), c(c(b(?x_4)))> by Rules <4, 2>
develop reducts from lhs term...
<{2}, c(c(a(?x_4)))>
<{1}, b(c(c(?x_4)))>
<{}, b(c(a(?x_4)))>
develop reducts from rhs term...
<{5}, b(a(b(?x_4)))>
<{4}, c(c(a(?x_4)))>
<{}, c(c(b(?x_4)))>
Inside Critical Pair: <b(b(a(?x_5))), c(c(c(?x_5)))> by Rules <5, 2>
develop reducts from lhs term...
<{0}, a(b(a(?x_5)))>
<{3}, b(b(b(?x_5)))>
<{}, b(b(a(?x_5)))>
develop reducts from rhs term...
<{5}, b(a(c(?x_5)))>
<{5}, c(b(a(?x_5)))>
<{}, c(c(c(?x_5)))>
Inside Critical Pair: <c(a(b(?x))), c(a(b(?x)))> by Rules <0, 4>
develop reducts from lhs term...
<{1}, c(c(b(?x)))>
<{}, c(a(b(?x)))>
develop reducts from rhs term...
<{1}, c(c(b(?x)))>
<{}, c(a(b(?x)))>
Inside Critical Pair: <c(c(c(?x_2))), c(a(c(?x_2)))> by Rules <2, 4>
develop reducts from lhs term...
<{5}, b(a(c(?x_2)))>
<{5}, c(b(a(?x_2)))>
<{}, c(c(c(?x_2)))>
develop reducts from rhs term...
<{1}, c(c(c(?x_2)))>
<{}, c(a(c(?x_2)))>
Inside Critical Pair: <c(b(b(?x_3))), c(a(a(?x_3)))> by Rules <3, 4>
develop reducts from lhs term...
<{4}, c(a(b(?x_3)))>
<{0}, c(a(b(?x_3)))>
<{}, c(b(b(?x_3)))>
develop reducts from rhs term...
<{1}, c(c(a(?x_3)))>
<{}, c(a(a(?x_3)))>
Inside Critical Pair: <c(c(c(?x_1))), b(a(a(?x_1)))> by Rules <1, 5>
develop reducts from lhs term...
<{5}, b(a(c(?x_1)))>
<{5}, c(b(a(?x_1)))>
<{}, c(c(c(?x_1)))>
develop reducts from rhs term...
<{3}, b(b(a(?x_1)))>
<{}, b(a(a(?x_1)))>
Inside Critical Pair: <c(c(a(?x_4))), b(a(b(?x_4)))> by Rules <4, 5>
develop reducts from lhs term...
<{5}, b(a(a(?x_4)))>
<{1}, c(c(c(?x_4)))>
<{}, c(c(a(?x_4)))>
develop reducts from rhs term...
<{3}, b(b(b(?x_4)))>
<{}, b(a(b(?x_4)))>
Commutative Decomposition failed: Can't judge
No further decomposition possible


Combined result: Can't judge
/tmp/filewVFgxh.trs: Failure(unknown CR)
(1915 msec.)