Revision history of "an empty string is not a natural number" (Z13498)

Kaa iribu : Kaa a fo leɛ sɛgebo na poɔ kyɛ laŋ a taa.
Legend: (pampana) = Yeli iruu iruu, (leɛ puori) = yeli iruu iruu sɛge kaabu, m = yeli feeŋ.