YES TRS: a__f(f(X)) -> a__c(f(g(f(X)))) a__c(X) -> d(X) a__h(X) -> a__c(d(X)) mark(f(X)) -> a__f(mark(X)) mark(c(X)) -> a__c(X) mark(h(X)) -> a__h(mark(X)) mark(g(X)) -> g(X) mark(d(X)) -> d(X) a__f(X) -> f(X) a__c(X) -> c(X) a__h(X) -> h(X) max/plus interpretations on N: a__f_A(x1) = max{6, 2 + x1} a__f#_A(x1) = max{6, 2 + x1} f_A(x1) = max{5, 2 + x1} f#_A(x1) = max{5, 2 + x1} a__c_A(x1) = max{7, x1} a__c#_A(x1) = max{7, x1} g_A(x1) = max{1, x1} g#_A(x1) = max{1, x1} d_A(x1) = max{7, x1} d#_A(x1) = max{7, x1} a__h_A(x1) = max{5, 7 + x1} a__h#_A(x1) = max{5, 7 + x1} mark_A(x1) = max{8, 8 + x1} mark#_A(x1) = max{8, 8 + x1} c_A(x1) = max{7, x1} c#_A(x1) = max{7, x1} h_A(x1) = max{6, 7 + x1} h#_A(x1) = max{6, 7 + x1} precedence: mark > a__f = a__h > f = a__c = g = h > d = c