class TestData<K> {}
interface TerminalOp<L, M> extends IntermediateOp<L, M> {}
interface IntermediateOp<L1, M1> { boolean m(L1 l, M1 m);}

class Test<T, U> {
  protected U exerciseOps(TestData<T> data, TerminalOp<T, U> terminal, IntermediateOp<T, U>... ops) {
    return exerciseOps(data, terminal,  (u, v) ->  u.equals(v));
  }
}

class Test1 {
  protected <T, U> U exerciseOps(TestData<T> data, TerminalOp<T, U> terminal, IntermediateOp... ops) {
    return exerciseOps(data, terminal,  (u, v) -> u.equals(v));
  }
}

class Test2 {
  protected <T, U> U exerciseOps(TestData<T> data, TerminalOp<T, U> terminal, IntermediateOp<T, U>... ops) {
    return exerciseOps(data, terminal,  (u, v) -> u.equals(v));
  }
}