Input TRS:
    1: g(c(),g(c(),x)) -> g(e(),g(d(),x))
    2: g(d(),g(d(),x)) -> g(c(),g(e(),x))
    3: g(e(),g(e(),x)) -> g(d(),g(c(),x))
    4: f(g(x,y)) -> g(y,g(f(f(x)),a()))
    5: g(x,g(y,g(x,y))) -> g(a(),g(x,g(y,b())))
Number of Rules: 5
Direct QWPOS(mSum) ... failed.