Does Alice like wine or beer?

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Alice, Bob, Charlie and Dianne each make the following statements:

Alice: I am telling the truth.

Bob: Alice is telling the truth.

Charlie: Bob is telling the truth.

Dianne: Charlie is lying.

Only one of the four people is telling the truth. Which one? Explain your answer.

They now make the following statements:

Alice: Bob is lying.

Bob: Charlie is lying.

Charlie: I like beer.

Dianne: 2+2=4.

Now two of the four people are telling the truth. Which two? Explain your answer.

They are now joined by Egbert. They each make the following statements:

Alice: I like wine.

Bob: Charlie is lying.

Charlie: Alice is lying.

Dianne: Alice likes beer.

Egbert: Alice likes beer.

Now three of the five people are telling the truth. Which ones? Explain your answer.