function (
    a,                          // argument array
    b, s, l, r                  // variables
) {
    l = (                       // l is length of a
        s = a.slice().sort()    // s is copied and sored array of a
    ).length,
    r = s[l - 1] - s[0];        // r is max(a) - min(a)
    b = '';                     // b is return value

    while (l--)                             // loop l times
        b = String.fromCharCode(            // charcode: 9601 - 9608
                                            // (some browser could not render unicode 9604 and 9608 ...?)
            9601 + ~~ 7 * (a[l] - s[0]) / r // use "~~" instead of Math.floor()
        ) + b;                              // concat forward
    return b
}