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“Four” is a sight word that children often learn early in their reading education. It is one of the basic number words and is frequently used in various contexts, such as counting and simple math problems.

### References:
1. **Fry, E. B., & Kress, J. E. (2006).** *The Reading Teacher’s Book of Lists (5th ed.).* Jossey-Bass.
2. **Dolch, E. W. (1948).** *Problems in Reading.* Southern Illinois University Press.