// We'll say that a number is 'teen' if it is in the range 13..19 inclusive.
// Given 2 int values, return true if one or the other is teen, but not both


var loneTeen1 = function (a, b) {

    if ((((a >= 13) && (a <= 19)) && !((b >= 13) && (b <= 19))) || (((b >= 13) && (b <= 19)) && !((a >= 13) && (a <= 19)))) {
        return true;
    } else return false;

}


var loneTeen2 = function (a, b) {

    var aa = 0;
    var bb = 0;

    if ((a >= 13) && (a <= 19)) {
        aa = 1;
    }

    if ((b >= 13) && (b <= 19)) {
        bb = 1;
    }

    if (aa + bb === 1) {
        return true;
    } else if ((aa + bb === 2) || (aa + bb === 0)) {
        return false;
    }

}