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allow fixed variables is term tightening
Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
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@ -1377,15 +1377,11 @@ namespace lp {
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std_vector<unsigned> cleanup;
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m_tightened_columns.reset();
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for (unsigned j : m_changed_terms) {
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if (
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j >= lra.column_count() ||
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if (j >= lra.column_count() ||
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!lra.column_has_term(j) ||
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lra.column_is_free(j) ||
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is_fixed(j) ||
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!lia.column_is_int(j)
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!term_has_int_inv_vars(j)
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) {
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!lia.column_is_int(j) ||
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!term_has_int_inv_vars(j)) {
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cleanup.push_back(j);
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continue;
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}
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