prime p = 2000521: T[9] rational, |P^1[9]| = 26, contains P^1[3]
number of cubics: 104
smooth cubics (J_4 = S_4): 104 of 104
at every vertex: 78 cubics, 26 tangent directions, 3 cubics (from 3 pencils) per direction: True
pairs: 5356, anomalies (incl. non-rational intersections): 0
off-vertex intersection points: 1872 (expected 9*26*8 = 1872); on exactly 4 cubics: 1872; one per pencil: 1872
quadruple points per cubic: [72] (expected 9*(9-1) = 72)
time 15s
