Comment by infogulch

So I have the ability to arbitrarily change the bias on every flip, and you don't think debiasing is affected?

How about this: for the next string of generated bits, for every even bit the bias is 90% towards 1, and every odd bit the bias is 90% towards 0.

raw: 0101010101010111010101010001010101010101

'debiased': 1111111111111111