How to generate a list of pairs for all combination possible?

Hello

Like Laeticha I am also trying to generate, in two columns, a list of pairs from a list of names.
For example, if my original list is:
201
202
203
204

Then I would like to generate the following pair list in two columns:
column 1 column 2
201 202
201 203
201 204

and so on.

JBeaucaire's code works really well, but:
a) I don't need each number paired with itself, e.g. 201 201
b) I only need each pair once, i.e. I need 201 204 but I don't then need 204 201

Does anyone have any ideas? Thank you!

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