input.xreate
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	find6 = function: bool
	{
	x = [1, 2, 3, 4, 5, 6, 7]: [num]; //эффективная инициализация
	y = map (x) [el]-> {2 * el};

	exists(y, 12);
	}

	exists = function: (list:[a], el: a)->bool
	{
	acc: bool;
	acc = reduce(list, false) [el, acc] ->
	{
	acc = acc & (el == e): saturated(true);
	}
	}