Input TRS:
    1: f(a(),f(a(),f(b(),f(x,y)))) -> f(b(),f(c(),f(b(),f(a(),f(a(),f(a(),f(x,y)))))))
    2: f(a(),f(c(),f(x,y))) -> f(b(),f(x,y))
Number of Rules: 2
Direct POLO(Sum) ...Direct QLPOS ...Direct QKBOS ... failed.