mailbox editor help

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heya! i'm trying to figure out how to use the mailbox editor in pkhex for pokemon platinum. i want to add pieces of mail into the PC with custom messages, but i don't know where to find what number corresponds to what word (the part of pkhex where you input the message gives you the option to input numbers, not words). is there a table somewhere that matches words with what number it corresponds to in pkhex, or something like that? thank you!