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For question 4 of the sample paper,
I found the following final graph when a node of depth 4 is to be expanded:
G = {1,2,3,6,7,10,11,4,8,12,13,9,5}
As for OPEN = {10,13,6,9,11,12}
and CLOSED = {1,2,3,4,5,7,8}
For Question 5
I found AB(A, -infinity, infinity)=1
and the cut off nodes are node G and hence O and P and it is an alpha cutoff.