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Vector :: class {
	// constructor
	init (a, b, c) {
	    // instance variables
		this.x = a;
        this.y = b;
        this.z = c;
	}

	// instance method (built-in operator overriding)
	operator + (v) {
        return Vector(this.x + v.x, this.y + v.y, this.z + v.z);
	}

	string() {
		return "[" + str(this.x) + ", " + str(this.y) + ", " + str(this.z) + "]";
	}
}

// initialize a new vector object
v1 := Vector(1, 2, 3);

// initialize a new vector object
v2 := Vector(4, 5, 6);

// call + function in the vector object
v3 := v1 + v2;

// returns string "[1,2,3] + [4,5,6] = [5,7,9]"
print "% + % = %\n", v1.string(), v2.string(), v3.string();