Four families
Four families were on a joint trip. In the first family, there were three siblings: Alica, Betka, and Cyril. In the second family were four siblings: David, Erik, Filip, and Gabika. In the third family, there were two siblings, Hugo and Iveta. Three siblings in the fourth family were Ján, Karol, and Lukáš. On the way, children were divided into groups so that in each group, there were all children with the same number of brothers and no one else. How could children be divided? Specify all options.
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