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How do I replace/merge two fields (and where can I read about this)?

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Hi,
A neewbie question here:
I have imported a csv-file with two columns, A and B. For each row I want to create a new field, C, where the 2. and 3. character in column A should be replaced with the characters in the column B:

A B C
SX0 50 S50
RX0L 10 R10L
DX0DP 10 D10DP

I guess I should use "Strings Cut" and "String Operation", but I do not understand how. Anybody? (I know how to do the output, is is just the merging I do not get.)

What would be a good place to read about the usage of the steps?

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