The rules for counting groups have changed. You can find them in the new "Guidelines and Standards for Tactile Graphics" posted on the web at http://www.brailleauthority.org/tg/web-manual/index.html
6.8.2 covers this topic. Rules are different for K-3 materials (220.127.116.11) vs. grades 4 and up (18.104.22.168)
Examples that illustrate the rules can be viewed by clicking on the underlined links in the narrative on the web page.
A similar question appears in the Tactile Graphics forum, titled "Counting blocks in 2nd grade," which you may find helpful to read.
Please let me know if you have further questions.
Lindy Walton (Committee Member)
edited by Lindy on 10/17/2011