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They can't accept a hard border because it would be disastrous in NI. They can't accept different regulations between NI and UK because of unionism. Ergo there is no form of Brexit that they can actually support except BINO. But Tories hate that and DUP have attached themselves to the Tories.
I don't know if CU+PV would pass, Ken Clarke said attaching PV to it would probably cause it to lose more votes than it gains ("moderate" Tories/Labour don't want PV).
Hammond is apparently pushing for PV + May's WA which I think could pass.
What I can't quite understand is what kind of Brexit the DUP want...
Would be amazing if they switched up to remaining at the end as they have begun softly whispering.