Let 
,
, ...,
be distinct primitive elements of a two-dimensional lattice M such that 
for i = 1, ..., 
. Each collection 
then forms a set of rays of a unique complete fan in M, and therefore determines a two-dimensional toric variety 
,, ..., be distinct primitive elements of a two-dimensional lattice M such that for i = 1, ..., . Each collection then forms a set of rays of a unique complete fan in M, and therefore determines a two-dimensional toric variety 
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