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Flip strands error from Michigan Imputation Server

When I try to using Michigan Imputation Server to impute GWAS data, I got an error like:

Error: More than 100 obvious strand flips have been detected. Please check strand. Imputation cannot be started!

I have searched for solutions, but for now, none of the solutions solve my problem.

Also, I have searched PLINK, which has an option to use command plink --file data --flip list.txt --recode, can anyone tell me how to generate such list.txt?

snp sequence plink imputation michigan

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