Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Former country name | Former codes | Period of validity | ISO 3166-3 code | New country names and codes |
| --- | --- | --- | --- | --- |
| British Antarctic Territory | BQ , ATB , 080 | 1974–1979 | BQAQ | Merged into Antarctica ( AQ , ATA , 010 ) |
| Burma | BU , BUR , 104 | 1974–1989 | BUMM | Name changed to Myanmar ( MM , MMR , 104 ) |
| Byelorussian SSR | BY , BYS , 112 | 1974–1992 | BYAA | Name changed to Belarus ( BY , BLR , 112 ) |
| Canton and Enderbury Islands | CT , CTE , 128 | 1974–1984 | CTKI | Merged into Kiribati ( KI , KIR , 296 ) |
| Dahomey | DY , DHY , 204 | 1974–1977 | DYBJ | Name changed to Benin ( BJ , BEN , 204 ) |
| Dronning Maud Land | NQ , ATN , 216 | 1974–1983 | NQAQ | Merged into Antarctica ( AQ , ATA , 010 ) |
| France, Metropolitan | FX , FXX , 249 | 1993–1997 | FXFR | Merged into France ( FR , FRA , 250 ) |
| French Afar and Issas | AI , AFI , 262 | 1974–1977 | AIDJ | Name changed to Djibouti ( DJ , DJI , 262 ) |
| German Democratic Republic | DD , DDR , 278 | 1974–1990 | DDDE | Merged into Germany ( DE , DEU , 276 ) |
| New Hebrides | NH , NHB , 548 | 1974–1980 | NHVU | Name changed to Vanuatu ( VU , VUT , 548 ) |
| Panama Canal Zone | PZ , PCZ , 594 | 1974–1980 | PZPA | Merged into Panama ( PA , PAN , 591 ) |
| Sikkim | SK , SKM , 698 | 1974–1975 | SKIN | Merged into India ( IN , IND , 356 ) |
| Southern Rhodesia | RH , RHO , 716 | 1974–1980 | RHZW | Name changed to Zimbabwe ( ZW , ZWE , 716 ) |
| Upper Volta | HV , HVO , 854 | 1974–1984 | HVBF | Name changed to Burkina Faso ( BF , BFA , 854 ) |
| Viet-Nam, Democratic Republic of | VD , VDR , 704 | 1974–1977 | VDVN | Merged into Viet Nam ( VN , VNM , 704 ) |
Question:
Name the former codes for  merged into panama ( pa , pan , 591 )
Answer:
PZ , PCZ , 594