Is there a particular reason why you want the file format to be in that structure? It's not an ideal structure to read For example, to read a structure like that you'd have to read each 3 line block. This means that if you decided to add a 4th line to future blocks, the script would break quite badly.

If you really want that format is it possible that your app could use XML instead? That would make it a lot easier to read/write to and save a lot of work if you decide to change the format in the future

Alan