@TimWardCam @MartinEscardo There is always scope for errors.

I love these discussions that assume humans are the golden benchmark that never makes mistakes or errors.

As you correctly were taught, check your work if at all possible.

And all the clever rules that apply to how to deal with outputs from algorithms apply to human output too. Potentially with modification, because humans can lie maliciously. And with that observation, let's close that argument with a round of “they eat the dogs”