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 : Latticepolarized K3 surface
