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The defining_relation method should output a Relation object, not a list.

This function would create a Design object from a numpy array containing a FATL design.
The function would:

• check that the array only has 4 or 2 level factors
• compute basic factors out of the four-level factors (since they're always defined in the same way)
• try to find column numbers out of the BF previously defined
• raise a error if no column numbers could be found (specifying where it failed)
• output a design object

In the example of the design:
Design(runsize=32, m=2, cols=[5, 6, 7, 9, 10, 11, 13, 14, 15, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26])

Removing four-level factor generates a design with m=1, and n=20 but the columns are
[4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 18, 20, 21, 22, 24, 25, 26, 28, 29]
and two columns here should not be part of these.

https://github.com/ABohynDOE/fatld/blob/6140880fb46993c1b1d954b25a09cc1d5b122618/fatld/design.py#L965C1-L965C69

Should be combi and not comb

For the moment they are not included but for resolution III designs it might create some wrong results

Non-generated math in the factors section