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How many arrangements are there for four children to queue up for photos in the second grade math problem?
Suppose four students are A, B, C and D, and the arrangement may be as follows.

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ABDC

ACBD

ACDB

ADBC

ADCB

BACD

BADC

BCAD

BCDA

BDAC

BDCA

CABD

CADB

CBAD

CBDA

CDAB

CDBA

DABC

DACB

DBAC

DBCA

DCAB

DCBA

***24 species

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