Termination w.r.t. Q of the given QTRS could be disproven:

0 QTRS
↳1 NonTerminationProof (⇔)
↳2 NO

(0) Obligation:

Q restricted rewrite system:
The TRS R consists of the following rules:

a(x1) → x1
a(b(x1)) → b(c(a(a(x1))))
b(c(x1)) → x1
c(c(x1)) → b(x1)

Q is empty.

(1) NonTerminationProof (EQUIVALENT transformation)

We used the non-termination processor [OPPELT08] to show that the SRS problem is infinite.

Found the self-embedding DerivationStructure:
a b b b b → a b b b b a

a b b b b → a b b b b a
by OverlapClosure OC 3
a b b b b → a b b b c c a
by OverlapClosure OC 3
a b b b b → a b b b c a c a
by OverlapClosure OC 2
a b → a a
by OverlapClosure OC 3
a b → b c a a
by original rule (OC 1)
b c →
by original rule (OC 1)
a b b b → b b b c a c a
by OverlapClosure OC 3
a b b b → b b a b c a
by OverlapClosure OC 3
a b b b → b c c a b c a
by OverlapClosure OC 3
a b b b → b c a c a b c a
by OverlapClosure OC 2
a b b → b c a c a a
by OverlapClosure OC 3
a b b → a b c a a
by OverlapClosure OC 2
a b → a a
by OverlapClosure OC 3
a b → b c a a
by original rule (OC 1)
b c →
by original rule (OC 1)
a b → b c a a
by original rule (OC 1)
a b → b c a
by OverlapClosure OC 2
a b → b c a a
by original rule (OC 1)
a →
by original rule (OC 1)
a b → b c a
by OverlapClosure OC 2
a b → b c a a
by original rule (OC 1)
a →
by original rule (OC 1)
a →
by original rule (OC 1)
c c → b
by original rule (OC 1)
a b → b c a
by OverlapClosure OC 2
a b → b c a a
by original rule (OC 1)
a →
by original rule (OC 1)
a →
by original rule (OC 1)
c c → b
by original rule (OC 1)

(2) NO