The rule is that if you have a loss on the disposition of stock, you cannot purchase the same stock within 30 days before this sale or within 30 days after this sale. This creates the wash sale rule. Since you disposed of all of the like stock, this is no longer a concern. You simply report the combined wash sale basis and the sale price for the last sale.
Yes, you are correct in your example. You will now take advantage of the combined cost basis (adding any past unused wash sale losses to the cost basis creating an accumulative basis). So as long as this is the final sale without any repurchase it doesn't matter how many trades there were before the December 16, 2021 sale.
@DB2022
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