Question: Name the former codes for  Merged into Panama ( PA , PAN , 591 )
SQL: SELECT "Former codes" FROM "1-222666-1" WHERE "New country names and codes" = 'Merged into Panama ( PA , PAN , 591 )';

Question: Name the total number for period of validity for Upper Volta
SQL: SELECT COUNT("Period of validity") FROM "1-222666-1" WHERE "Former country name" = 'Upper Volta';