[CentOS] Openoffice 2.1 install error?

When I installed OpenOffice 2.1, I installed a number of 'core' rpms:

openoffice.org-core01-2.1.0-6.i586.rpm openoffice.org-core02-2.1.0-6.i586.rpm openoffice.org-core03-2.1.0-6.i586.rpm openoffice.org-core03u-2.1.0-6.i586.rpm openoffice.org-core04-2.1.0-6.i586.rpm openoffice.org-core04u-2.1.0-6.i586.rpm openoffice.org-core05-2.1.0-6.i586.rpm openoffice.org-core05u-2.1.0-6.i586.rpm openoffice.org-core06-2.1.0-6.i586.rpm openoffice.org-core07-2.1.0-6.i586.rpm openoffice.org-core08-2.1.0-6.i586.rpm openoffice.org-core09-2.1.0-6.i586.rpm openoffice.org-core10-2.1.0-6.i586.rpm

Are they all needed? What are they all in there for?

thank you.