Similarly, we can ask if the regex accepts no strings or one single static string. To do this, we ask Ostrich to find two distinct strings matching the regex and require that neither be empty:
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（四）购进农产品时，除取得增值税专用发票或者海关进口增值税专用缴款书外，按照农产品收购发票或者农产品销售发票计算的进项税额，国务院另有规定的除外；