My 2022 1040-SR's Federal Carryover Worksheet, line 14a, shows an amount under 2021 but not 2022. Did I use the 2021 amount in 2021 or is it available to use in 2023?

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Also, how do I use #s on Carryover Worksheet, lines 16b and 17b, for 2021 and 2022 on 2022 return?