Is this LED matrix anod or cathod common?

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hi all!
as title, did found tutorial:

http://www.multiwingspan.co.uk/arduino.php?page=matrix

but, can tell me if configuration anod common or cathod common? , how recognize them?

thank much!

basically common anode configuration, because resistor in cathode.

but terms virtually meaningless when applied ready build matrix in essence either.


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