=== k=1 max=1 ===
testing 0 size-1 sets from [2,1]
irreducible_count=0 accepted_search_nodes=0
=== k=2 max=2 ===
testing 0 size-2 sets from [2,2]
irreducible_count=0 accepted_search_nodes=0
=== k=3 max=4 ===
testing 1 size-3 sets from [2,4]
irreducible_count=0 accepted_search_nodes=0
=== k=4 max=8 ===
testing 35 size-4 sets from [2,8]
irreducible_count=0 accepted_search_nodes=0
