hi jw01. it's not impossible, like FDibbins mentioned, but isn't it torturing to you or the user to pick the the nth selection? if you insist, you can do this array formula in C5:
otherwise, another alternative is naming those validation list properly. those with repeated values will have a number tagged to them. for eg, somewhere in Calc Graph row 66, put in:
=IF(COUNTIF($B$66:$B$1256,B66)>1,B66&"_"&COUNTIF(B$66:B66,B66),B66)
copy down. copy this range of values & Paste Special -> Values into B66 onwards. so 3HM will become 3HM_1, 3HM_2, & so on. those with no repeats will turn up like the original. with that, the formula in C5 can be:
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