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simplify ""* to ""
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@ -4094,6 +4094,10 @@ br_status seq_rewriter::mk_re_star(expr* a, expr_ref& result) {
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result = re().mk_to_re(str().mk_empty(seq_sort));
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return BR_DONE;
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}
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if (re().is_to_re(a, b) && str().is_empty(b)) {
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result = a;
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return BR_DONE;
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}
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if (re().is_plus(a, b)) {
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result = re().mk_star(b);
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return BR_DONE;
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