func (n *Node) cache(counts ints_int.MultiMap, m ints_ints.MultiMap, key []int32, nodes []lattice.Node) error {
for _, node := range nodes {
err := m.Add(key, setToInt32s(node.(*Node).pat.Items))
if err != nil {
return err
}
}
return counts.Add(key, int32(len(nodes)))
}
