Hi, do you think that this is a nice problems?

For some set M, let there be partial orderings of M, <1, <2 of M.

We are looking for a "merge" < of the pos <1 <2 in he following sense:

- < extends <1
- if there are x <2 y such that NOT x < y (that is, the merge has
"rejected" that the relation x <2 y), then there is a "legitimate
reason" for that, that is, a chain (  y = u0, u1, ..., ul = x)
such that

for all i: (ui <1 u_i+1) OR (ui <2 u_i+1)
AND
ui < u_i+1

(that is, the rejected relation is inconsistent with the transitive
closure of <1 and that part of <2 that we already decided to throw
into <.)

Now what would be a good way to compute a merge of a sequence of
partial orderings <1, <2, <3, ...? Is there something in o(n^2)?


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