sMarked_dfibdfibzyxdfib(s(s(x)),y)dfib(s(x),dfib(x,y))dfib(s(s(x)),y)dfib(s(x),dfib(x,y))Marked_dfib(s(s(x)),y)Marked_dfib(s(x),dfib(x,y))Marked_dfib(s(s(x)),y)Marked_dfib(x,y)dfib(s(s(x)),y)dfib(s(x),dfib(x,y))Marked_dfib(s(s(x)),y)Marked_dfib(s(x),dfib(x,y))Marked_dfib(s(s(x)),y)Marked_dfib(x,y)Marked_dfib1Marked_dfib(s(s(x)),y)Marked_dfib(x,y)Marked_dfib(s(s(x)),y)Marked_dfib(s(x),dfib(x,y))dfib(s(s(x)),y)dfib(s(x),dfib(x,y))