Parsing a file that contains 2 types of delimeters

Now that I have a file that looks something like this;

20050926 Unknown
20050926 MUREXFO
20050926 MUREXFO
20050926 MUREXFO
20050926 Unknown
20050926 KADDUSS
20050926 KADDUSS
20050926 KADDUSS
20050926 MUREXFO

Is there a way in vi that I can search the file and remove any line containing the string "Unknown" and MUREXFO. I'v tried a few and it only seems to remove the string, not the actual line.

Thanks for your help

Here is one way of doing this Morgado,
As you asked, using "vi":

:%g/Unknown/d

:%g/MUREXFO/d

Thanks so much! Works perfectly!! :smiley: