let R be the TRS under consideration

b(b(_1)) -> a(a(b(_1))) is in elim_R(R)
let r0 be the right-hand side of this rule
p0 = 0.0 is a position in r0
we have r0|p0 = b(_1)
b(b(_2)) -> a(a(b(_2))) is in R
let l'0 be the left-hand side of this rule
theta0 = {_1/b(_2)} is a mgu of r0|p0 and l'0

==> b(b(b(_1))) -> a(a(a(a(b(_1))))) is in EU_R^1
let r1 be the right-hand side of this rule
p1 = epsilon is a position in r1
we have r1|p1 = a(a(a(a(b(_1)))))
a(a(a(a(_2)))) -> b(a(a(a(_2)))) is in R
let l'1 be the left-hand side of this rule
theta1 = {_2/b(_1)} is a mgu of r1|p1 and l'1

==> b(b(b(_1))) -> b(a(a(a(b(_1))))) is in EU_R^2
let r2 be the right-hand side of this rule
p2 = 0.0.0.0 is a position in r2
we have r2|p2 = b(_1)
b(b(_2)) -> a(a(b(_2))) is in R
let l'2 be the left-hand side of this rule
theta2 = {_1/b(_2)} is a mgu of r2|p2 and l'2

==> b(b(b(b(_1)))) -> b(a(a(a(a(a(b(_1))))))) is in EU_R^3
let r3 be the right-hand side of this rule
p3 = 0 is a position in r3
we have r3|p3 = a(a(a(a(a(b(_1))))))
a(a(a(a(_2)))) -> b(a(a(a(_2)))) is in R
let l'3 be the left-hand side of this rule
theta3 = {_2/a(b(_1))} is a mgu of r3|p3 and l'3

==> b(b(b(b(_1)))) -> b(b(a(a(a(a(b(_1))))))) is in EU_R^4
let r4 be the right-hand side of this rule
p4 = 0.0 is a position in r4
we have r4|p4 = a(a(a(a(b(_1)))))
a(a(a(a(_2)))) -> b(a(a(a(_2)))) is in R
let l'4 be the left-hand side of this rule
theta4 = {_2/b(_1)} is a mgu of r4|p4 and l'4

==> b(b(b(b(_1)))) -> b(b(b(a(a(a(b(_1))))))) is in EU_R^5
let r5 be the right-hand side of this rule
p5 = 0.0.0.0.0.0 is a position in r5
we have r5|p5 = b(_1)
b(b(_2)) -> a(a(b(_2))) is in R
let l'5 be the left-hand side of this rule
theta5 = {_1/b(_2)} is a mgu of r5|p5 and l'5

==> b(b(b(b(b(_1))))) -> b(b(b(a(a(a(a(a(b(_1))))))))) is in EU_R^6
let r6 be the right-hand side of this rule
p6 = 0.0.0 is a position in r6
we have r6|p6 = a(a(a(a(a(b(_1))))))
a(a(a(a(_2)))) -> b(a(a(a(_2)))) is in R
let l'6 be the left-hand side of this rule
theta6 = {_2/a(b(_1))} is a mgu of r6|p6 and l'6

==> b(b(b(b(b(_1))))) -> b(b(b(b(a(a(a(a(b(_1))))))))) is in EU_R^7
let r7 be the right-hand side of this rule
p7 = 0.0.0.0 is a position in r7
we have r7|p7 = a(a(a(a(b(_1)))))
a(a(a(a(_2)))) -> b(a(a(a(_2)))) is in R
let l'7 be the left-hand side of this rule
theta7 = {_2/b(_1)} is a mgu of r7|p7 and l'7

==> b(b(b(b(b(_1))))) -> b(b(b(b(b(a(a(a(b(_1))))))))) is in EU_R^8
let l be the left-hand side and r be the right-hand side of this rule
let p = epsilon
let theta = {}
let theta' = {_1/a(a(a(b(_1))))}
we have r|p = b(b(b(b(b(a(a(a(b(_1))))))))) and
theta'(theta(l)) = theta(r|p)
so, theta(l) = b(b(b(b(b(_1))))) is non-terminating w.r.t. R

Termination disproved by the forward process
proof stopped at iteration i=8, depth k=9
168 rule(s) generated