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this is the first paragraph.
It has three lines.
...
one line running "perl -p00 -le 's/\n/ /gs;s/\s+/ /g;'"
on that file, with multiple blanks condensed into one.

perl -p00 -le 's/\n/ /gs;s/\s+/ /g;' text

perl -p00 -i.bak -le 's/\n/ /gs;s/\s+/ /g;' text