MAYBE
0.00/0.02	 The problem does not contain well-formed TRSs:
0.00/0.02	   Strict Trs:
0.00/0.02	     { U31(tt()) -> N
0.00/0.02	     , U42(tt()) -> s(plus(N, M))
0.00/0.02	     , plus(N, s(M)) -> U41(isNat())
0.00/0.02	     , plus(N, 0()) -> U31(isNat())
0.00/0.02	     , U11(tt()) -> U12(isNat())
0.00/0.02	     , U12(tt()) -> tt()
0.00/0.02	     , isNat() -> tt()
0.00/0.02	     , isNat() -> U11(isNat())
0.00/0.02	     , isNat() -> U21(isNat())
0.00/0.02	     , U21(tt()) -> tt()
0.00/0.02	     , U41(tt()) -> U42(isNat()) }
0.00/0.02	   StartTerms: basic terms
0.00/0.02	   Strategy: none
0.00/0.02	EOF