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If X = {a, {b},c}, Y= {{a},b,c} and Z ...

If `X = {a, {b},c},`
`Y= {{a},b,c}` and `Z = {a,b, {c}}`,then `(X nn Y) nn Z` equals to

A

`{a, b, c}`

B

`{{a}, {b}, {c}} `

C

`{Phi}`

D

`Phi`

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