Array.prototype.indexOf = function (val) {
    for (var i = 0; i < this.length; i++) {
        if (this[i] == val) return i;
    }
    return -1;
};

Array.prototype.remove = function (val) {
    var index = this.indexOf(val);
    if (index > -1) {
        this.splice(index, 1);
    }

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