if(command.type == "REMOVE"){
    state = state.deleteIn(["lists", command.nodeType, "nodes", command.id]);
    state = state.updateIn(["lists", command.nodeType, "ids"], list => list.filter(id => id != command.id));
    state = state.update("names", names => names.delete(command.id));
    state.get("lists").forEach((list, type) => {
        list.get("nodes").forEach((node, id) => {
            state = state.updateIn(["lists", type, "nodes", id, "connections", "data"],
                data => data.filter(elem => elem.get("id") != command.id));
            state = state.updateIn(["lists", type, "nodes", id, "connections", "order"],
                order => order.filter(elem => elem.split(".")[0] != command.id));
            return true;
        });
        return true;
    });
}