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Extracted from #443

fromTo.put(fromNameString, toNameString);
}

// Validate collisions with untouched dataset columns ("Untouched" = columns that are not
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{a b c}[a -> z, b -> z] // Z already exist

{a b c}[b -> z, b -> y] // b already renamed (variable not found?)

{a b c}[a -> b] // ?

{a b c}[a -> z, b -> a] // Allowed?

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