How to randomly assign a text to an image?

Hello everyone! 
I have a problem and I would be really appreciate if someone could help me!
I have 24 stories (texts) and 24 images. I want to present a story and an image at the same time to the participants each trial:
1)    Each story is paired with an image randomly. 
2)   Each stimulus (both story and image) appears only once.
How can I achieve that?
I tried to use loop & merge: put all the images in field 1 and put all the stories in field 2. But the image is paired with story in the fixed pattern in this way, that is, story X always paired with image Y ...  What I want is each story paired with image randomly. For example, participant A may see story 1 paired with image 3, participant B may see story 1 paired with image 8, participant C may see story 1 paired with image 20, etc. I have no idea what to do.

Thanks in advance! 