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Complete execution flow of the following program

Misses: 0 
def traffic_light_decision(light_color, street_clear):
    if light_color == "green":
        if street_clear == "yes":
            return "Go!"
        else:
            return "Wait!"
    elif light_color == "yellow":
        return "Slow down!"
    elif light_color == "red":
        return "Stop!"
    else:
        return "Invalid"