Please tell me two simplest poker skills!

The magician wrote his prediction on a piece of paper and put it aside. The magician asked the audience to choose a card, and then put the selected card back to shuffle. The magician asked the audience to divide the cards face up into five parts. The audience chose a card they just chose. Later, the magician opened the prophecy he had just written on paper and found it was right.

Appropriate requirements:

1. Randomly draw 15 cards from an ordinary playing card.

2. A pen and a piece of paper

Magic teaching:

1. Write on the paper with a pen: "The card you chose is the one in the middle!" Of course, this sentence cannot be made public. Then fold the paper and put it aside.

Please wash the cards and divide them into 3 parts, each with 5 cards.

3. Please randomly select 1 card, and then select 1 card in this card to remember. Then put the card back in the card he chose and wash it casually. Then put this card on any 1 of the other two cards. Then fold 1 card on it. The card she chose should be in the middle. )

4. Please hand out 5 cards. (This refers to normal dealing, that is, 1 time, 1 Zhang Xianfa, 5 copies, and then superimposed on each card). So there will be five cards, three cards each.

Please turn all the cards over (that is, face up) and point out the card he chose.

6. Take out the paper with the prophecy written at the beginning and spread it out.