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+PoS construction
+================
+
+* compare BFS/DFS order
+
+Proof extraction
+================
+
+3 strategies:
+* naive: node by node
+* batching
+* sorting + naive
+
+Question
+========
+
+protocol is misspecified: challenges are generated with a PRNG, but need to
+specify how to map random int to the proper range (different PoS have different
+sizes)