/**
 * Returns a range from given inputs in increasing bijective base-26 order
 * @param {string} a string containing only uppercase letters
 * @param {string?} b Optional string containing only uppercase letters
 * @returns {string[]} Increasing order array of strings from [a to b] or ["A" to a]
 * @Example bb26Range("C") //["A", "B", "C"]
 * @Example bb26Range("AZ", "BC") //["AZ","BA","BB","BC"]
 * @Example bb26Range("S", "Q") //["Q","R","S"]
 */
export default function bb26Range(a: string, b?: string): string[];
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