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You haven't described the format of your input file. Just showing us a 10 line sample input file lets us makes lots of possibly erroneous assumptions that might or might not be valid in your actual...

awk 'NR == FNR {CNT[$NF]++;if (!($NF in order) && CNT[$NF]>1) order[$NF]=++cnt;next} $NF in order {print $0, order[$NF]}' file file

where exactly are you stuck?