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sub a { 
     print "letter a";
...
     print "whispers softly";
}
1;

require Foo;

...
print "\n";

$ perl require.pl 
whispers softly Letter B

package Foo;
sub a{
...
}
1;

$ perl require.pl 
Undefined subroutine &main::mother_mary called at require.pl line 3.