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Figure 5
Left: the three vectors [{\bf v}_{1} = (0,1)], [{\bf v}_{2} = (2,0)], [{\bf v}_{3} = (3,0)] form a basis of [{\bb Z}^{2}]. Other images: none of the three pairs [({\bf v}_{2},{\bf v}_{3})], [({\bf v}_{1},{\bf v}_{2})], [({\bf v}_{1},{\bf v}_{3})] form a basis (insufficient for full connectedness) of [{\bb Z}^{2}]. Some straight edges are shown curved for better visibility.

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