HP HP-28S - Doing Arithmetic

Check the 14 remaining combinations. The last combination looks
like this.
When you're done checking combinations, return to the main catalog.
QU I T Irnmlmlll __ 1miIlI1lilllB1
You can now move to another catalog entry and check its combina-
tions of arguments. When you're done with the catalog, return to
normal calculator operation.
QUIT
Alternatively, you can exit the catalog by pressing FETCH, which also
writes the name of the current command in the command line.
1: Getting Started 33