Input TRS:
    1: c(c(c(a(x,y)))) -> b(c(c(c(c(y)))),x)
    2: c(c(b(c(y),0()))) -> a(0(),c(c(a(y,0()))))
    3: c(c(a(a(y,0()),x))) -> c(y)
Number of Rules: 3
Direct POLO(Sum) ...Direct QLPOS ...Direct QKBOS ... failed.