How do I set it up to recognize the text is in order?

I haven't done this in months and I'm struggling. I'm not even sure what to Google (Note: Word order - not it.)

The goal is for the kids to put the words in order to make a sentence.

Once the words are in order on the yellow block the child will press the green check box to see if it's correct. If it's not, the words stay where they are and the child continues to move the words around. If it is correct they get a Clippy that tells them great job and they move on to the next layout.

I'm trying to get it so the game doesn't lock the words into any kind of position, the words should easily be dragged and dropped anywhere.

How do I get each layout to realize when txt1 is first, txt 2 is second and so on?

I swear I've done this before, but I can't remember.

Thank you.

Maybe you could try to compare the X position of each text and if it equals a certain number then you would know that the right word is in the right spot?