Your household has been randomly assigned to one of twelve invoicing groups. If you are in the first group, you will receive an annual invoice for 365 francs in January. If you are in the second group, you will receive an invoice for one month in January, then the annual invoice in February. The third group will receive an invoice for January to February in January, then the annual invoice in March, and so on. This model will be reproduced throughout the year, as you can see from the table below.

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