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hello: hello.pl Foo.pm
    pp hello.pl -o hello.exe

package Foo;
# test1
1;

#!/c:/perl/bin/perl
use lib q(.);
use Foo;
print "Hello!\n";

manual: ch01.fmt ch02.fmt ch03.fmt
        lp ch0[1-3].fmt
...
        tbl ch02 | nroff -mm > ch02.fmt
ch03.fmt: ch03a ch03b ch03c
        nroff -mm ch03[abc] > ch03.fmt