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Step 3: After installating the Adafruit GFX Library library function, enter
"Adafruit_SSD1306" in the input text box to search for the SSD1306 library
function, and then install Adafruit SSD1306, as shown in the figure below.
Step 4: After the installation is completed, close arduinoIDE, and then find
the "Adafruit_SSD1306.h" file in the "Adafruit_SSD1306" library function