Input TRS:
    1: rec(rec(x)) -> sent(rec(x))
    2: rec(sent(x)) -> sent(rec(x))
    3: rec(no(x)) -> sent(rec(x))
    4: rec(bot()) -> up(sent(bot()))
    5: rec(up(x)) -> up(rec(x))
    6: sent(up(x)) -> up(sent(x))
    7: no(up(x)) -> up(no(x))
    8: top(rec(up(x))) -> top(check(rec(x)))
    9: top(sent(up(x))) -> top(check(rec(x)))
    10: top(no(up(x))) -> top(check(rec(x)))
    11: check(up(x)) -> up(check(x))
    12: check(sent(x)) -> sent(check(x))
    13: check(rec(x)) -> rec(check(x))
    14: check(no(x)) -> no(check(x))
    15: check(no(x)) -> no(x)
Number of Rules: 15
Direct POLO(mSum) ... failed.