I have a file that has 90 columns and 20,000 rows and looks like
   C/G CC GG CG G/T GG TT GT C/T CC TT CT A/G AA GG AG A/C AA CC  AC A/T AA
TT AT

I want to write a code that will read through each row first the first looks
at the first column and then replace the three columns with 12 if it is the
same as the first column e.g. third column 11 if it is a repeat of the first
alphabet like the second column and 22 if it a repeat of the second
alphabet.

Can you please give some hint how I can start coding for this, like command
names, I am not a programmer and an R beginner. my out put should look like
this

   11 22 12 11 22 12 11 22 12 11 22 12 11 22 12 11 22 12

Thank you in advance.

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