You will see that most of the pins are named like this: PXY where X=A,B,C,D and Y=0 to 7. These are known as the I/O pins of the microcontroller.
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2D test-case in #UFOCFD - note use of the new "stag" variable to specify stagnation inlet values (derived from the specified u p & t values) #html # hta .