Formula for matrix production

Hi there!

I have an issue with the definition of the Prime user function.

There are several matrices 2*2 in the general case ( the exact matrix number oscillates from 1 to 4-5-6).

Each matrix has a lowercase index (connected to the data from the parameters table). I want to define user function to make matrix production. Due to my modest coding skills, I have no results to describe as appropriate. The relevant search on the forum gave some material but didn't seem to help. 

https://community.ptc.com/t5/Mathcad/Production-of-Matrices-Elements/m-p/676964 

In the attachment, there is my problem sample, performed in Prime 10.0.0

Any assistance would be appreciated!