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help with the circuit diagram


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in the same  circuit please someone tell me(
http://www.zen22142.zen.co.uk/Circuits/Alarm/water_lev_alm.htm
why there is a 1Mohm resistor with 1uF cap inbetween the logic gates ,also the 47k and 10nF cap.please ?
                                what they are for and are they necesaary for normal functioning?if they are not there what can happen?

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