At least one of the two cards to the left of 1 and k is an A.

You can know that the rightmost one is K.

2. the two cards on the right side of a also have an a.

Know that the two on the left are both A's

3. There is at least one red heart in the two cards on the left of the square.

You know, the rightmost one is a square, and A has a heart.

4. One of the two cards on the right of the heart is plum blossom.

You know, the heart is the leftmost.

So three are

Hearts a, clubs a, diamonds k