"PDQ",,,
"line 1",,,"http://file.a/A%20Guide%20"
"line 2",,,"https://www.whitgt.pdf"
"line 3, and xyz",,,"http://www.c/main.pdf"
"line 4 "" and abc",,,http://file.a/A%20Guide%20
line 5,,,https://www.whitgt.pdf
line 6,,,http://file.a/A%20Guide%20