Help! I am completing a truth table for the following combination logic diagram and I was wondering what the black dots on the diagram mean? PLEASE let me know what they do any if they do anything to the numbers

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Clunker motors inc. is recalling all vehicles in its extravagant line from model years 1999—2002 as well as all vehicles in its guzzler line from model years 2004—2007. a boolean variable named recalled has been declared. given a variable modelyear and a string modelname, write a statement that assigns true to recalled if the values of modelyear and modelname match the recall details and assigns false otherwise.