Sharing variables and subroutines between modules: unexpected warnings and errors.

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### begin_: tryStuffAlpha.pm
    package tryStuffAlpha;
...
    1;
    __END__

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### begin_: tryStuffBeta.pm
    package tryStuffBeta;
...
    1;
    __END__

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### begin_: tryStuff_Caller.pl
    use strict;
...
    print "7: ". $tryStuffAlpha::OppositePermaLink;    ### FAILS
    print "8: ". $tryStuffBeta::OppositePermaLink;     ### FAILS

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### Run Result Alpha (tryStuffAlpha.pm run all by itself)
Use of uninitialized value ... at tryStuffAlpha.pm line 29.
...
7: AOppositeLink=
8: BOppositeLink=

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