{"type":"block","line":1,"col":1,"val":"content","mode":"replace"}
{"type":"comment","line":1,"col":1,"val":" Main content goes here","buffer":true}
{"type":"newline","line":2,"col":1}
{"type":"block","line":2,"col":1,"val":"content","mode":"append"}
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{"type":"eos","line":4,"col":1}