Divide and conquer.

1. Rename node numbers in each file from $n to $Filename.$n (during input
processing).

2. Set union of PRED_NODE lists of same-key nodes.

3. Rename nodes arbitrarily again, & remove duplicates from merged lists;
possibly with a Topological Sort to make it less arbitrary.

-- 
Bill
@n1vux bill.n1...@gmail.com

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