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Mostrando items 1-10
| Birth order (1) |
| Conocimiento de números (1) |
| Cálculo mental (1) |
| Educación elemental (1) |
| Elementary school children (1) |
| Family size (1) |
| Gender (1) |
| Género (1) |
| Mental arithmetic (1) |
| Number system knowledge (1) |
