SSDT generation creates 5 SSDT's, which one to use?

I followed TonyMac's guide on how to generate an SSDT but no matter what I do, even deleting all the SSDT's from the folder prior to running the script, I get 5 SSDT's written to '~/Library/ssdtPRGen/'...named SSDT.aml, SSDT-1.aml etc. Some of them are 23kb in size, others 2kb and no idea which one to use.