{"ast_node_type":"variable","tokens":[{"end":60,"kind":"keyword","start":0,"text":"let"}]}
    let aub = vec![1, 3, 4, 5, 7, 11, 15, 2000, 3000, 4000];
    let b = vec![3, 4, 11, 3000, 4000];
    let aib = vec![11, 3000];