I am completely lost here. Your sample input file contains 12 lines (with each line being a record). There is no indication given anywhere in your sample input or in the description of your requirements specifying the order in which fields are supposed to be present. Since you specify that each output record should contain NA in the place of each missing input field in each record and since none of your input records contains more than one of the six strings you're looking for in various fields, why doesn't each of the 12 output records you would get from your 12 input records contain at least 5 occurrences of NA?

I see no relationship between your description of your requirements and the desired output you say you want from your sample input.

Note that what your code seems to do is look for six strings on each input line and, if and only if, at least one of those string is found, that input record is copied to the output with NA added as the last output field on that line. All other input lines are discarded. I don't see any relationship between your code and your requirements and I don't see any relationship between your code and the desired output you say you want.

If you can't write down a clear description of your requirements, it isn't surprising that you can't write code that will do what you want. If you can't write down a clear description of your requirements, there is no chance that anyone else will be able to write code that does what you want.