Factbox - How can Britain avoid a post-Brexit border for Northern Ireland?

LONDON/DUBLIN (Reuters) - Britain said on Wednesday there should be no border posts or immigration checks between Ireland and the British province of Northern Ireland after Brexit, in a paper that attempts to resolve one of the most complex aspects of its departure from the European Union.Here are some of the main details of the British proposals:BORDER INFRASTRUCTUREBritain reaffirmed its opposition to a "hard border" with passport and customs checks and said there should be no physical border