For the excess contribution in 2019, if you had any income earned on the excess you need to amend your tax return in 2019 to include it in your income.
For the excess contribution in 2020, you would do the same on your 2020 tax return.
To determine if you earned any income, you would need to go by the income earned during the time between when you made the excess contribution to the time you withdrew it from your account.
You can't just treat the withdrawals as non-taxable, since some of the money was from excess contributions, that don't grow tax-free.
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