You can remove the sub-bricks from the sub-brick list when you give the dataset name as input. This works for almost all AFNI commands.
3dcalc -a epi_r1+orig'[0..32,34,36,38..$]' -expr a -prefix extracted_sb
In this previous thread, there is a script to take a censor list to extract sub-bricks if you want to do something a little more complicated.
[
afni.nimh.nih.gov]
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afni.nimh.nih.gov];