The 18 Domains and 47 sub-datasets - How are they related?

The Domain has 18 values, 0 to 17, in the meta-data file train.csv. However there are 47 sub-datasets mentioned in the Global Wheat Head Dataset 2021 description on page 6. Also I see a submission by VictorKras2008 having domain values from 18 to 46 in submission.csv. Please explain how to relate the 47 sub-dataset names Ethz_1, Rres_1, …ARC_1 to the training data images which only have 18 domains.

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