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2 matroids

label ▲rank ⇅n ⇅#bases ⇅#automorphisms ⇅simple ⇅char set ⇅rs dim ⇅birational type ⇅
3.11.1518453111491✓all but 21point over Q(a)/(a^2 - 7)
4.9.92237491141✓all2point over Q(a)/(a^2 - 7)