I have a file that has been partially recoded so that data points that were formerly letter combinations are now -1, 0, or 1. I need to finish recoding the GG and CC data points. The file looks like this:

ID 1 2 3 4 5 6 7 8
83845676 0 0 0 0 CC -1 CC CC
838469. -1 -1 1 GG CC 0 CC 1
83847041 -1 . 0 0 . 0 0 0
83847.4 0 -1 1 1 CC 0 0 0
83847085 0 CC 0 0 0 0 0 0
83847118 . -1 1 GG . GG CC 0
83847162 GG -1 1 0 0 0 0 0
83847165 -1 -1 . GG CC 0 GG 0

The problem with the GG and CC is that in either case they can be a -1 or a 1, depending on what has already been recoded. If a GG is in a column that already contains 1's then GG must = -1. If the GG is in a column that already contains -1's, then the GG must be a 1. This is also true for the CC columns. I have a total of >64,000 columns so I can not go through and list which column is which. It has been suggested that I need to write an algorithm to do this but I am not very familiar with programming. Can anyone help me?
Thanks!