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you don't have the same requirement, you have a different one. it is really wiser to start your own question then jump on another one.
still it is quite simple in principle. it depends a bit if you have 4 hosts (so the part before / in something like http://host.domain.ext/uri or really only need to redirect 4 hosts + uri?
if it is 4 hosts you have DNS point them all to the same virtual server on which you redirect to the one other hosts + uri with the iRule above.
if it is hosts + uri then it depends on if you can redirect everything send to the hosts or need only send some of the uri. then you will need to do a switch or if statement in the iRule on [HTTP::uri].
pools don't come into play with basic redirection. you take the http request and send it somewhere else.
this should get you started, this isn't very complex, with some googling and browsing here you should be able to pull it off.