let R be the TRS under consideration

f(g(_1,_2),_1,_3) -> f(_3,_3,_3) is in elim_R(R)
let r0 be the right-hand side of this rule
p0 = 1 is a position in r0
we have r0|p0 = _3
g(_4,_5) -> _4 is in R
let l'0 be the left-hand side of this rule
theta0 = {_3/g(_4,_5)} is a mgu of r0|p0 and l'0

==> f(g(_1,_2),_1,g(_3,_4)) -> f(g(_3,_4),_3,g(_3,_4)) is in EU_R^1
let l be the left-hand side and r be the right-hand side of this rule
let p = epsilon
let theta = {_1/_3, _2/_4}
let theta' = {}
we have r|p = f(g(_3,_4),_3,g(_3,_4)) and
theta'(theta(l)) = theta(r|p)
so, theta(l) = f(g(_3,_4),_3,g(_3,_4)) is non-terminating w.r.t. R

Termination disproved by the forward process
proof stopped at iteration i=1, depth k=2
4 rule(s) generated