/**
 * @param {String} userName
 */
function line1(userName){}

/**
 * @param {String, Number} product
 */
function line2(product){}

/**
 * @param {String} [accessLevel] accessLevel is optional
 */
function line3(accessLevel){}

/**
 * @param {String} userName name of the user
 */
function line4(userName){}

/**
 * @param {String} accessLevel accessLevel is optional
 */
function line5(accessLevel){}
