build-table.xreate
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	Tree = type(NodeData) variant {
	LEAF(data:: NodeData),
	GROUP(nodes:: [ref(Tree(NodeData))])
	}

	Guard = type variant {
	a, b
	}.

	DecisionTree = type Tree(Guard).

	buildTable = function(nodes:: [DecisionTree], size:: i32):: [ DecisionTree ]
	{
	tableInit = arr_create(size):: [DecisionTree].

	loop fold(nodes->node:: DecisionTree, tableInit->table):: [DecisionTree]
	{
	switch variant(node):: [DecisionTree]
	case (LEAF) { table + { LEAF(node["data"]) } }
	case (GROUP) { table + GROUP(buildTable(nodes["nodes"])) }
	}
	}