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# DayPredict.pm
# maps moods to predictions
...
}

1; # module must return a true value

#!/usr/bin/perl

...
}

__END__

$ perl predict_day.pl happy

# MyDay.pm
# Interface to objects representing days
...
}

1; # module must return a true value

#!/usr/bin/perl
use strict; use warnings; use feature 'say';
...
}

__END__

$ perl my_day.pl sad