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Read CSV data with multiple lines with 2 trailer records


I'm having a csv file format like below.

So there is 3 lines with 2 trailer records. Length of lines is same and first trailer record has different size from 2nd one. 

Line records are starting with L character and there can be maximum 26 line records with 2 trailer records. But here there's 3 lines with 2 trailer records per set.

As I mentioned above there can be upto 26 lines with 2 trailer records per set and in this example there is 2 sets. There can be multiple sets as well.

Can someone tell me how to read this file from ION. I cannot use fixed length for lines and trailers since lines length and 2 trailer length is different.

Thank you