| Value | Category |
|---|---|
| 0000 | None |
| 1000 | Literacy center |
| 1001 | Literacy center, 0 years |
| 1002 | Literacy center, 1 year |
| 1003 | Literacy center, 2 years |
| 1004 | Literacy center, 3 years |
| 1005 | Literacy center, 4 years |
| 1006 | Literacy center, 5 years |
| 1008 | Literacy center, 6 years |
| 1009 | Literacy center, unknown years |
| 1010 | Pre-school |
| 2000 | Primary |
| 2100 | Primary (old system) |
| 2101 | Primary, 0 years |
| 2102 | Primary, 1 year |
| 2103 | Primary, 2 years |
| 2104 | Primary, 3 years |
| 2105 | Primary, 4 years |
| 2106 | Primary, 5 years |
| 2107 | Primary, 6 years |
| 2109 | Primary, unknown years |
| 2200 | Basic (new system) |
| 2201 | Basic, 0 years |
| 2202 | Basic, 1 year |
| 2203 | Basic, 2 years |
| 2204 | Basic, 3 years |
| 2205 | Basic, 4 years |
| 2206 | Basic, 5 years |
| 2207 | Basic, 6 years |
| 2208 | Basic, 7 years |
| 2209 | Basic, 8 years |
| 2210 | Basic, 9 years |
| 2211 | Basic, 10 years |
| 2299 | Basic, unknown years |
| 3000 | Secondary |
| 3100 | Secondary (old system) |
| 3101 | Secondary, 0 years |
| 3102 | Secondary, 1 year |
| 3103 | Secondary, 2 years |
| 3104 | Secondary, 3 years |
| 3105 | Secondary, 4 years |
| 3106 | Secondary, 5 years |
| 3107 | Secondary, 6 years |
| 3108 | Secondary, 7 years |
| 3109 | Secondary, 8 years |
| 3199 | Secondary, unknown years |
| 3200 | Middle (new system) |
| 3201 | Middle, 0 years |
| 3202 | Middle, 1 year |
| 3203 | Middle, 2 years |
| 3204 | Middle, 3 years |
| 3299 | Middle, unknown years |
| 3300 | Post-primary technical (special education) |
| 3301 | Special education, 1 year |
| 3302 | Special education, 2 years |
| 3303 | Special education, 3 years |
| 3304 | Special education, 4 years |
| 3305 | Special education, 5 years |
| 3306 | Special education, 6 years |
| 4000 | Post-secondary |
| 4001 | Post-secondary, 0 years |
| 4002 | Post-secondary, 1 year |
| 4003 | Post-secondary, 2 years |
| 4004 | Post-secondary, 3 years |
| 4005 | Post-secondary, 4 years |
| 4006 | Post-secondary, 5 years |
| 4007 | Post-secondary, 6 years |
| 4008 | Post-secondary, 7 years |
| 4009 | Post-secondary, 8 years |
| 4010 | Post-secondary, 9 years |
| 4099 | Post-secondary, unknown years |
| 4100 | Technical college |
| 4101 | Technical college, 0 years |
| 4102 | Technical college, 1 year |
| 4103 | Technical college, 2 years |
| 4104 | Technical college, 3 years |
| 4109 | Technical college, unknown years |
| 4200 | University undergraduate |
| 4201 | University undergraduate, 0 years |
| 4202 | University undergraduate, 1 year |
| 4203 | University undergraduate, 2 years |
| 4204 | University undergraduate, 3 years |
| 4205 | University undergraduate, 4 years |
| 4206 | University undergraduate, 5 years |
| 4207 | University undergraduate, 6 years |
| 4208 | University undergraduate, 7 years |
| 4209 | University undergraduate, 8 years |
| 4210 | University undergraduate, 9 years |
| 4299 | University undergraduate, unknown years |
| 4300 | University graduate |
| 4301 | University graduate, 0 years |
| 4302 | University graduate, 1 year |
| 4303 | University graduate, 2 years |
| 4304 | University graduate, 3 years |
| 4305 | Year 4 |
| 4306 | Year 5 |
| 4307 | Year 6 |
| 4399 | University graduate, unknown years |
| 9997 | Response suppressed |
| 9998 | Unknown |
| 9999 | NIU (not in universe) |
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