I don’t entirely understand what you try to do?
You have three string arrays, two you want to combine and then replace part of the combined string with keys of a third one?
And now you need to combine them with a different index?
Am I at least close to what you want to do?
You have to only run one ForEach loop for one array (probably the first one), and use the Array Index pin to Get the elements of the other arrays.
The way you have it now, the three ForEach loops will run at the same time and interfere with each other and the result won’t ever be what you want it to be.
Never mind I found the solution thanks to the Map variables.