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Let A={1,2,{3,4},5}. Which of the follow...

Let A={1,2,{3,4},5}. Which of the following statement are incorrect and why?
{3,4} `sub` A

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v) We cannot count .1 sub A., but either .1 in A. or .1 sub A.
vii) We cannot write .1,2,5 in A., but .1,2,5 sub A.
viii) Since .1,2,3 sub A.
ix) .phi sub A.
xi) Either .phi sub A. or .sub A.
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