Between versus among [duplicate]

I am working in a text that I use the following:

"I measure the similarities between companies."

There are many companies, but I evaluate the similarity "between" 2 companies. I mean if I have 3 companies, namely A, B, C, I have to evaluate the similarities in pairs and I provide the similarity between A and B, B and C, and A and C, i.e, three measures of similarities.

My doubt is the text above should be

"I measure the similarities among companies."

Or is it correct?

Solution 1:

Between is used as a comparison while among is used as a grouping word. If you are comparing 2-3 companies then "There are many companies, but I evaluate the similarity 'between' 2 companies.".