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You may be finding Connect to LCD via I2C, default address 0x27 (A0-A2 not jumpered) confusing. These refer to the I2C address selection lines of the IO expander (the PCF8574T) used on the I2C LCD display and not to the A0-A2 analog pins of the Arduino itself.
The note // Wiring: SDA pin is connected to A4 and SCL pin to A5. is referring to the analog pins ...
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