Steven, I have just seen where the clue lies from the link that was put on your last question. Could N = Nitrogen rather than National?
It seems that there are a number of alternatives for the abbreviations.
I can't think of anything that could be PA _ P
If it is nitrogen, then it would be PE_P
and if it is not kappa and was peso, it would be K - - O - (kilos ??) and Peso would fit
BUT I am not sure, there are other combinations that may be correct. It is 10 pm where I am, so shall sign off now. Good Luck!