Pattern Codes are pXX where XX is 0-1a-z so the full range goes from 00 to zz (note: by convention we tend to not use 00).
Once there used to be meaning in the codes but that's been retired so just use the first available in the sequence. For 87079 that would be p0r.
Once there used to be meaning in the codes but that's been retired so just use the first available in the sequence. For 87079 that would be p0r.