20E08 20 rooted tree 9 20F28 8 20F65 8 05C05 7 20B35 6 group automorphisms 6 local isometry 6 20E06 5 decision trees 5 дерева рішень 5 4 05C25 4 20F50 4 automorphisms of trees 4 diagonal embedding 4 direct limit 4 homogeneous symmetric group 4 05C50 3 classification 3 decision tree 3 finite automaton 3 neural networks 3 tree 3 water treeing 3 нейронні мережі 3 05C20 2 05C25,43A85 2 05C31 2 05C69 2