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export default function getValidT9Words(    num: string,    words: string[],): string[] {    return words.filter((w) =>        Array.prototype.every.call(            w,            (c, i) =>                num[i] === String(key[c.charCodeAt(0) - "a".charCodeAt(0)]),        )    );}const key = [    2,    2,    2,    3,    3,    3,    4,    4,    4,    5,    5,    5,    6,    6,    6,    7,    7,    7,    7,    8,    8,    8,    9,    9,    9,    9,];