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I have variables A, B & C as follows in a dataset:
A B D
1
1
1 2
3
5 9 1
I need to check if varibales C & E exits in that dataset.
If variable C & E is not in that dataset then have those
two variables as follows without any values for C & E:
A B C D E
1
1
1 2
3
5 9 1
Thanks in advance to write this code.
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