There is a phenomena which is confused by wronglywritten characters and ancient and nowadays words in " Chinese" tryout teaching material in secondary school in Jiangsu Province.
江苏省中等职业学校《语文》试用教材中,存在着通假字与古今字混淆的现象。
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You can decide from the date line whether an order is fulfilled, a contract or an agreement is in effect, or a bill is paid. Therefore, it shouldn't be wronglywritten or be omitted.