Excel should support a proper inverse to "Text to columns"
 

The following sequence of steps gets tricky at step 3:

1) Split Text into columns
2) Perform edits on text
3) Merge Text into a single column again

Currently it can only be done with 1) a macro, or 2) a temporary column and
the use of concatenate, which gets tedious and error-prone if many columns
are involved. (concatenate doesn't support cell ranges, for one thing).

In priniple, it seems like this kind of thing ("inverse of") should be built
into excel.

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