I have a dataset which contains several multi-column measurement sets per row.
Col 1 identifies patient:
Col1 Col2 Col3 Col 4 Col 5 Col 6
Col7 ...
Patient Treatment Outcome Advice Treatment Outcome Advice
"P1" "T1" "O1" "A1" "T2" "O2"
"A2"
Please advise a reshape strategy to generate an output frame with a single
measurement per row, e.g.,
Col1 Col2 Col3 Col4
Patient Treatment Outcome Advice
"P1" "T1" "O1" "A1"
"P1" "T2" "O2" "A2"
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