“Adober Reader 9.1 Available - Adobe Reader < 9” = Upgrade any version less than 9 to version 9.
“Adober Reader 9.1 Available - Adobe Reader 9” = Only applicable/relevant to verison 9.0
“Adobe Reader 9.1.1 Available - Adobe Reader 9.1” = Only applicable/relevant to verison 9.1
“Adobe Reader 9.1.2 Available - Adobe Reader 9.1.1” = Only applicable/relevant to verison 9.1.1
“Adobe Reader 9.1.3 Available - Adobe Reader 9.1.2” = Only applicable/relevant to verison 9.1.2
Because the Adobe Reader updates install consecutively and each one wants a restart, my Adobe Reader baseline installs all the updates anytime the components are relevant, and without requiring a restart (otherwise it wants a restart after each update).