/**
 * Matches exactly one letter (lowercase or uppercase).
 * @param {string} [type='g'] - The flag for the regular expression (default is 'g').
 * @returns {RegExp} The regular expression to match exactly one letter.
 */
export function oneLetter(type?: string): RegExp;
/**
 * Matches one or more letters (lowercase or uppercase).
 * @param {string} [type='g'] - The flag for the regular expression (default is 'g').
 * @returns {RegExp} The regular expression to match one or more letters.
 */
export function multiLetters(type?: string): RegExp;
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