code: @Override
      public boolean match(Term term) {
          FunctionEnum fx = term.getFunctionEnum();
          if (fx != DEGRADATION) {
              // Degradation functions only
              return false;
          }
          List<BELObject> args = term.getFunctionArguments();
          if (noItems(args)) {
              // Function arguments cannot be empty
              return false;
          }
  
          BELObject x = args.get(0);
          if (!(x instanceof Term)) {
              // First argument must be a term
              return false;
          }
  
          return true;
      }
docs: {@inheritDoc}