[R] Subset using partial values

[Newbie19_02]

Thanks again for the help but what I am having trouble with is that I get:

1012  CAO0103166     01/04/1999           I200
1016  CAO0103166     03/05/2000           I200
1024  CAO0103166     20/06/1997           I209
1025  CAO0103166     25/02/1999           I209
1027  CAO0103166     27/08/1999           I200
1058  CAO0107171     11/01/2002           N411
1104  CAO0113512     14/02/2003           I209


I'm trying to avoid getting N411?

Thanks,
Natalie
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