I recently came across your R package `Agi4x44PreProcess` and I'm having
issues with the filtering step due to my `targets` file (I did not include
a `Treatment` or a GErep` column).

               Cy3              Cy5
Array1:  pre-drug    pre-drug
Array2:  pre-drug    post-drug
Array3:  post-drug  pre-drug

How would I label these groups? If treatment groups are 'pre-pre',
'pre-post', and 'post-pre', are the GErep values would be `1`, `2`, and
`3`, corresponding to each treatment group?

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