i1 : K3(6,1,-2)
o1 = K3 surface with rank 2 lattice defined by the intersection matrix: | 10 1 |
| 1 -2 |
-- (1,0): K3 surface of genus 6 and degree 10 containing rational curve of degree 1 (GM fourfold)
-- (2,0): K3 surface of genus 21 and degree 40 containing rational curve of degree 2
o1 : Lattice-polarized K3 surface
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