Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_222666_1 ( former_codes VARCHAR, new_country_names_and_codes VARCHAR )

### Question ###
Name the former codes for merged into panama ( pa , pan , 591 )

### Accurate SQL ###

SELECT former_codes FROM table_222666_1 WHERE new_country_names_and_codes = "Merged into Panama ( PA , PAN , 591 )"