In a ccp structure, the `:`A. first and third layers are repeatedB. first and fourth layers are repeatedC. second and fourth layers are repeatedD. first, third and sixth layers are repeated

In a ccp structure, the `:`A. first and third layers are repeatedB. fi

1.	In a ccp structure, the `:`A. first and third layers are repeatedB. first and fourth layers are repeatedC. second and fourth layers are repeatedD. first, third and sixth layers are repeated
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In a ccp structure, the `:`A. first and third layers are repeatedB. first and fourth layers are repeatedC. second and fourth layers are repeatedD. first, third and sixth layers are repeated

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