US-P02.001ab ।US-P02.001cd ॥
In plain words
It cannot be negated. So when everything has been struck out with "not this, not this," it is what remains — and you come to know it directly: I am not this. I am not this.
Close to the Sanskrit
Because of the impossibility of negating [it], it is what is left over by 'not thus, not thus'; truly one arrives at 'I am not this, I am not this.'