Think about it as trying to turn on a lightbult with a lightswitch. There are two switches, one is in the correct spot on the wall and clearly should turn on the light. You turn it on and off on and off and nothing. You scratch your head because it should turn it on. The thing is the real lightswitch is hidden at foot level behind a furniture. You are not even thinking of this, just so focuses on turning on and off the one on the wall. If you give up, go to bed and come back maybe you think about checking for another light switch and voila!
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