.map(
            elem => {
                elem.className = new_value ? 'selector selector-active' : 'selector'
            });

        Object.keys(selectors_map).map(k => {
            selectors_map[k] = new_value
        });
        render();
        updateHistory();
    }

    unique_systems.map(elem => {
        let selector = document.createElement('a');
        selector.className = 'selector selector-active';
        selector.appendChild(document.createTextNode(elem));
        systems.appendChild(se