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returns source or target of s: fo(s,0) returns the source of s, fo(s,1) returns the target of s. The parameter i is taken modulo 2. | ||
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returns the i'th vertex of r in counterclockwise order, starting with the lower left vertex. The parameter i is taken modulo 4. | ||
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returns the i'th vertex of t. The parameter i is taken modulo 3. |