Пример #1
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 def iter_terms(self):
     return iter_emptyset()
Пример #2
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 def iter_quads(self):
     return iter_emptyset()
Пример #3
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 def iter_variables(self):
     return iter_emptyset()
Пример #4
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 def iter_terms(self):
     # iterates over alllinear terms, if any
     return iter_emptyset()