Phonology Assistant initially displays word lists ungrouped. A group of similar environments is a set of rows for which the phonetic data is similar in the positions immediately preceding and immediately following the phone(s) in the search pattern.
To group a word list by similar environments in the active search result tab, do one of the following:
On the View
menu, click 
Similar
Environments.
On the Search
toolbar or Distribution
Charts toolbar, click
Similar Environments.
Each group heading displays the specific phonetic data in the search environments, followed by a list of the records in the group.
To view all the records
under the group headings, click 
Expand All Groups.
To view only the group headings,
click 
Collapse
All Groups.
To remove the groupings,
click Similar Environments
again.
The tab
displays 
(Similar
Environments Options) so you can choose similar
environment options.