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__isl_take isl_qpolynomial_fold *fold1,
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__isl_take isl_qpolynomial_fold *fold2);
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__isl_take isl_qpolynomial_fold *fold, __isl_take isl_set *set, int max);
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int isl_pw_qpolynomial_fold_covers(__isl_keep isl_pw_qpolynomial_fold *pwf1,