Open question: my system for getting the double-past and double-future seems to lead to extreme ugliness if you want both layers to stick (meaning put both at the start). I don't think anyone wants to say "ɑn ɑn ...". This might not be a huge problem since the double-past is usually used in relation to the past, and so most of the time you'd probably only want one layer to stick (like I did in the example above). But is it still a problem?

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