[DGD] Version Number

[Mercy]

Hi there,
I'm new and I just have a quick question..
I'm running version 1.2p4, what does the p4 translate to, in terms of a 
version number, for the purpose of patching?
Sorry if I'm just being stupid and missing something obvious.
I'm sure I'll have a million and one other questions at some point. :)
Thanks,
Felix
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