Greetings!
Thank you for your recent offer of mysticism for math. I am sorry that I cannot accept it at this time. Since we had no advance knowledge of your offer my people have had no time to discuss it and I cannot take it upon myself to make such a momentous decision. My people will talk over your offer and we will let you know our decision by next turn.
I can tell you that we have had some discussion on this matter already and I do know that we would take writing or both mysticism and horseback riding (if, of course, your people possess the latter secrets). We never discussed trading math for either mysticism or horseback riding alone.
If you are willing to change your offer next turn to give us either (writing) or (mysticism and horseback riding) I can assure it is within my power to accept such a deal. Otherwise we can haggle a bit more.
donsig
Grand Vizeer of the Ironic People