Dear Wu Gong and Peter Ehlers,
thank you very much for your help debugging my script.

Now I have a general following up question:
Is there a straightforward way to rearrange the following dataset so that all first letters of each column will be combined in one column, all the second letters in a second column, all the third ones in a third column and so on, resulting in 7 columns, i.e. for the first individual (GM920222) GGGG AAAA TTTT TTAA GGGG CCAA CCCC ?

Thank you very much,
Laetitia

SampleID        A1      A2      A3      A4
GM920222        GATTGCC GATTGCC GATAGAC GATAGAC
GM930040        GTCATCA GAGTGCA ACTATAA GATTGCC
GM930040        GTCATCA GAGTGCA ACTATAA GATTGCC
GM960023        GATTGCC GTCATCA GATTGCC GATTGCC
GM920224        ACTAGAA GTCATCA GTCATCA ACTAGAA
GM920224        ACTAGAA GTCATCA GTCATCA ACTAGAA
GM920034        GATTGCC GTCATCA GATTGCA GATTGCA
GM920096        GATTGCC GATTGCC GATTGCA GATTGCC
GM930029        GTCATCA GATTGCC GTCATCA GATTGCC
GM940031        GATTGCC GAGTGCA GATTGCA ACTAGAA
GM960028        GATTGCC GAGTGCA GATTGCA ACTAGAA
GM980007        GTCATCA GATTGCC ACTTGAA GTCATCA
GM970009        ACTAGAA GTCAGAA GTCAGCA ACTAGCA
GM930026        ACTAGAA GAGTGCA GAGTGCA ACTAGAA
GM920031        GATTGCC GTCATCA GATTGCC GATTGCC
GM990105        GATTGCC GATTGCC GTCAGCA GTCAGCA
GM920202        GATTGCC GATTGCC GATTGCC GATTGCC
GM920089        GAGTGCA GTCAGAA ACTATCA GATTGCC
GM980051        ACTAGAA ACTAGAA GATAGCC GATAGCC
GM930109        GTCATCA GAGTGCA GTTTTAA ACTAGAA
GM940039        GTCATCA GAGTGCA GTTTGCC ACTTTCA
GM050099        GAGTGCA GTCAGAA GTTATCC ACTTTCA
GM050099        GAGTGCA GTCAGAA GTTATCC ACTTTCA
GM030005        ACTAGAA GAGTGCA ACTAGAA ACTAGAA
GM050009        ACTAGAA GATTGCC GATTGCC ACTAGAA
GM990027        GATTGCC GAGTGCA GATTGCA GATTGCC
GM990066        GATTGCC GTCATCA GTCATCA GATTGCC

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