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When can I put strategic advertisements in the sand table course?

In the sand table course, strategic advertisements can be carried out at the beginning of the year and in the first quarter. The beginning of the year and the first quarter are two different periods. At the beginning of the year, there were three tasks (advertising, attending an order fair and applying for a long-term loan). You must complete the operation before confirming the start of the first quarter, so you can't start it.