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So i came across this during my piano sight reading practice and I don't know how to understand it. There is a quarter note (C) with a whole note (C) right next to it. At first i thought they're just normal notes but these two are really close to each other. Also it's in 4/4 and there are 4 quarter notes plus a whole note so it doesn't add up. I don't have a teacher so I tried searching online but I can't find a mention of it anywhere. Thanks in advance.